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Cisco DCID 300-610 practice questions

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Question 1Data Center Network Design

In a Cisco data center design, which protocol provides a loop-free Layer 2 multipath topology by replacing STP with a routing-based fabric while still supporting Layer 2 adjacency for hosts?

  1. Cisco FabricPath Correct answer.
  2. Link Aggregation Control Protocol
  3. 802.1Q trunking with VTP pruning
  4. Spanning Tree Protocol with PortFast

Explanation

Cisco FabricPath builds a Layer 2 multipath fabric using a control plane similar to IS-IS, eliminating reliance on STP blocking ports while preserving Layer 2 semantics. It assigns hierarchical switch IDs and computes multiple equal-cost paths.

Question 2Data Center Network Design

Which Cisco Nexus feature allows a single physical switch to appear as multiple independent logical switches, each with its own management and configuration?

  1. Fabric Extender
  2. Virtual PortChannel
  3. Virtual Device Contexts Correct answer.
  4. Cisco FabricPath

Explanation

Virtual Device Contexts (VDCs) partition one physical Nexus chassis into independent logical switches, each with separate configuration, management interfaces, and fault domains. The admin VDC retains control over resource allocation.

Question 3Data Center Network Design

When designing a vPC domain between two Cisco Nexus switches, which component is responsible for preventing split-brain forwarding when the peer link fails?

  1. The FabricPath IS-IS adjacency
  2. The STP root bridge priority
  3. The VTP primary server election
  4. The vPC peer-keepalive link Correct answer.

Explanation

The vPC peer-keepalive link is a separate out-of-band path used to detect peer liveness. If the peer link fails but the keepalive is intact, the secondary peer suspends its vPC member ports to avoid duplicate forwarding.

Question 4Data Center Network Design

A design requires Layer 3 routing between VLANs on a Nexus switch using a single physical interface per VLAN with no additional hardware. Which approach satisfies this requirement?

  1. Deploy a dedicated external router for each VLAN
  2. Configure switched virtual interfaces (SVIs) on the Nexus Correct answer.
  3. Rely on VTP to route between VLANs
  4. Use Private VLAN isolated ports for inter-VLAN traffic

Explanation

SVIs provide integrated Layer 3 interfaces on the Nexus for each VLAN, allowing local routing without external hardware. Enabling the ip routing feature and assigning an IP address to each SVI completes the configuration.

Question 5Data Center Network Design

Which Cisco Nexus technology allows a parent switch to manage a large number of remote ports through a single management point while presenting them as local ports?

  1. Fabric Extender Correct answer.
  2. Virtual Device Context
  3. Virtual PortChannel
  4. Overlay Transport Virtualization

Explanation

A Fabric Extender (FEX) is a remote line card managed by a parent Nexus switch, presenting its ports as if they were local to the parent. This simplifies management and reduces the number of managed devices.

Question 6Data Center Network Design

In Cisco ACI, which construct defines the policy container that groups endpoints sharing the same network and bridge domain requirements?

  1. Contract
  2. Endpoint Group Correct answer.
  3. Tenant
  4. Application Profile

Explanation

An Endpoint Group (EPG) is a logical grouping of endpoints with common policy requirements, such as VLAN and bridge domain association. EPGs are contained within application profiles and tenants.

Question 7Data Center Network Design

Which protocol does Cisco Overlay Transport Virtualization use to carry Layer 2 frames between data centers across a Layer 3 core?

  1. MAC-in-UDP encapsulation Correct answer.
  2. VXLAN with BGP EVPN
  3. IS-IS with MPLS labels
  4. GRE with IPsec

Explanation

OTV encapsulates Layer 2 frames in a MAC-in-UDP header, allowing Layer 2 extension over an IP transport network. It uses an IS-IS control plane for MAC reachability but forwards data with UDP encapsulation.

Question 8Data Center Network Design

What is the primary purpose of a vPC peer link in a Cisco Nexus vPC domain?

  1. To provide out-of-band keepalive heartbeat only
  2. To connect the vPC domain to the FabricPath core
  3. To synchronize MAC and ARP tables and carry orphan traffic Correct answer.
  4. To carry all data traffic between vPC peers

Explanation

The peer link synchronizes forwarding tables such as MAC and ARP between vPC peers and carries traffic for orphan ports and single-homed devices. It is not intended to carry the bulk of dual-homed traffic, which flows over vPC member links.

Question 9Data Center Network Design

A network designer is planning a spine-leaf fabric where each leaf must reach every spine over Layer 3. Which routing design provides the most scalable and deterministic path selection?

  1. Static default routes on all leaves
  2. eBGP with unique AS numbers per leaf and spines as route reflectors Correct answer.
  3. OSPF with a single area across all leaves and spines
  4. IS-IS with a single level across the fabric

Explanation

eBGP with unique per-leaf AS numbers and spines acting as route reflectors provides deterministic, scalable path selection and limits flooding compared with link-state protocols. It is a common Cisco spine-leaf underlay design.

Question 10Data Center Network Design

Which Cisco Nexus feature allows a pair of switches to appear as a single logical switch for Layer 2 multipathing with a single management IP?

  1. Cisco Fabric Services
  2. FabricPath
  3. Virtual PortChannel Correct answer.
  4. Virtual Device Context

Explanation

vPC lets two Nexus switches present a single logical port channel and management endpoint to attached devices, enabling active-active Layer 2 multipathing. It avoids STP blocking while maintaining a loop-free topology.

Question 11Data Center Network Design

In a Cisco ACI design, which object is used to define the communication policy between two endpoint groups?

  1. Fabric Extender Profile
  2. Contract Correct answer.
  3. VRF
  4. Bridge Domain

Explanation

A contract defines the traffic rules and filters that govern communication between endpoint groups. It is applied to EPGs as a provider or consumer to permit specific traffic.

Question 12Data Center Network Design

A designer needs to extend a VLAN between two data centers over a Layer 3 WAN without stretching STP. Which technology best meets this requirement?

  1. Virtual PortChannel across sites
  2. 802.1Q trunk over the WAN
  3. Cisco FabricPath over the WAN
  4. Overlay Transport Virtualization Correct answer.

Explanation

OTV encapsulates Layer 2 frames in IP, allowing VLAN extension over a Layer 3 WAN while keeping STP domains isolated at each site. This avoids STP instability across the WAN.

Question 13Data Center Network Design

When designing a Nexus Fabric Extender topology, which statement correctly describes the supported connection between the FEX and its parent switch?

  1. The FEX connects to the parent using a fabric port channel or vPC Correct answer.
  2. The FEX connects to the parent through an OTV overlay
  3. The FEX connects to the parent using an IS-IS adjacency
  4. The FEX connects to the parent over a single physical link only

Explanation

A FEX connects to its parent switch through fabric ports, which can be bundled into a fabric port channel or vPC for redundancy and bandwidth. This provides resilient connectivity while the parent manages the FEX.

Question 14Data Center Network Design

Which consideration is most important when sizing the vPC peer link for a design with large amounts of orphan and single-homed traffic?

  1. The peer link must be a single 1 Gbps link for simplicity
  2. The peer link must be configured as an OTV overlay
  3. The peer link must be sized to carry orphan and failure-scenario traffic Correct answer.
  4. The peer link must match the aggregate bandwidth of all vPC member links

Explanation

The peer link should be sized to handle orphan port traffic and traffic that must traverse it during failure scenarios, not the full aggregate of member links. Over-provisioning to the aggregate of all member links is unnecessary.

Question 15Data Center Network Design

In a Cisco ACI fabric, which component provides the mapping of endpoints to their locations and is queried by fabric nodes?

  1. The contract filter
  2. The bridge domain table
  3. The COOP database Correct answer.
  4. The VRF table

Explanation

The COOP (Council of Oracles Protocol) database stores endpoint location information and is queried by fabric nodes to resolve endpoint addresses. It enables efficient forwarding decisions in the ACI fabric.

Question 16Data Center Network Design

A design requires Layer 3 isolation between two departments while allowing controlled communication through a firewall. Which ACI construct provides this isolation?

  1. A single EPG with contract filters
  2. A separate bridge domain for each department
  3. A separate VRF for each department Correct answer.
  4. A single application profile without contracts

Explanation

A VRF provides Layer 3 routing isolation between departments, and communication can be controlled through contracts and a firewall. Separate VRFs prevent unintended routing between the departments.

Question 17Data Center Network Design

Which Cisco technology enables active-active Layer 2 multipathing across a FabricPath fabric without relying on STP?

  1. FabricPath IS-IS with equal-cost multipath Correct answer.
  2. PortFast and BPDU Guard
  3. VTP pruning
  4. Private VLANs

Explanation

FabricPath uses IS-IS to compute multiple equal-cost paths, enabling active-active Layer 2 multipathing without STP blocking. This improves bandwidth utilization and convergence.

Question 18Data Center Network Design

A network designer is evaluating a spine-leaf fabric with 32 leaf switches and 4 spines. Which underlay design consideration most affects convergence time after a spine failure?

  1. The STP root bridge priority
  2. The routing protocol's fast convergence and ECMP capabilities Correct answer.
  3. The VTP domain name consistency
  4. The number of VLANs configured on each leaf

Explanation

Fast convergence and ECMP capabilities of the underlay routing protocol determine how quickly traffic reroutes after a spine failure. Protocols like BGP or IS-IS with tuned timers and ECMP provide rapid failover.

Question 19Data Center Network Design

Which Cisco Nexus feature allows a physical switch to be partitioned into multiple logical switches with independent fault domains?

  1. Virtual PortChannel
  2. Overlay Transport Virtualization
  3. Virtual Device Context Correct answer.
  4. FabricPath

Explanation

Virtual Device Contexts partition a single physical Nexus chassis into multiple logical switches, each with independent configuration and fault domains. This improves resource utilization and isolation.

Question 20Data Center Network Design

In a vPC design, what happens to vPC member ports on the secondary peer when the peer link fails but the peer-keepalive link remains up?

  1. They are suspended to prevent duplicate forwarding Correct answer.
  2. They are converted to routed ports
  3. They are added to the STP blocking state
  4. They remain forwarding normally

Explanation

When the peer link fails but the keepalive is intact, the secondary peer suspends its vPC member ports to prevent duplicate forwarding and split-brain conditions. The primary peer continues forwarding.

Question 21Data Center Network Design

A designer is comparing OTV and VXLAN EVPN for data center interconnect. Which statement correctly distinguishes their control planes?

  1. Both use BGP EVPN for MAC reachability
  2. OTV uses IS-IS for MAC reachability while VXLAN EVPN uses BGP EVPN Correct answer.
  3. Both use IS-IS for MAC reachability
  4. OTV uses BGP EVPN while VXLAN EVPN uses IS-IS

Explanation

OTV uses an IS-IS-based control plane to advertise MAC reachability between sites, while VXLAN EVPN uses MP-BGP with EVPN address families. The control-plane choice affects scalability and policy capabilities.

Question 22Data Center Network Design

Which ACI design consideration best explains why bridge domains are mapped to a single VRF for Layer 3 routing?

  1. Bridge domains within a VRF cannot have contracts applied
  2. Bridge domains within a VRF share a common Layer 3 routing table Correct answer.
  3. Bridge domains within a VRF share a common Layer 2 flooding domain
  4. Bridge domains within a VRF must use the same VLAN ID

Explanation

Bridge domains associated with the same VRF share a common Layer 3 routing table, enabling routing between subnets in that VRF. Different VRFs provide separate routing tables and isolation.

Question 23Data Center Network Design

In a large FabricPath fabric, which mechanism prevents loops while allowing all links to forward traffic?

  1. A reverse-path forwarding check on switch IDs Correct answer.
  2. LACP bundling of all links
  3. VTP pruning of VLANs
  4. STP blocking on redundant links

Explanation

FabricPath uses a reverse-path forwarding check based on hierarchical switch IDs to prevent loops while allowing all links to forward. This replaces STP blocking and enables multipathing.

Question 24Data Center Network Design

A designer must choose between a routed spine-leaf underlay and a Layer 2 FabricPath core for a new fabric. Which factor most strongly favors the routed underlay?

  1. The need to support a large number of VLANs across the fabric
  2. The need to avoid configuring routing protocols
  3. The need to minimize the number of IP addresses used
  4. The need for predictable ECMP and failure containment at Layer 3 Correct answer.

Explanation

A routed spine-leaf underlay provides predictable ECMP, failure containment, and scalability at Layer 3, which are strong advantages for large fabrics. FabricPath remains a Layer 2 option with different scaling characteristics.

Question 25Data Center Network Design

Which statement accurately describes the role of the vPC domain ID in a Cisco Nexus vPC design?

  1. It must match the STP root bridge priority
  2. It sets the OTV site identifier
  3. It must be unique per vPC domain and identifies the domain for peer communication Correct answer.
  4. It determines the VLAN range for the peer link

Explanation

The vPC domain ID uniquely identifies a vPC domain and is used in peer communication and configuration consistency. It must be consistent on both peers and unique among vPC domains.

Question 26Data Center Network Design

In a Cisco ACI fabric, which construct represents the physical switch that a designer registers with the APIC and that hosts fabric ports?

  1. A bridge domain subnet object
  2. An endpoint group contract scope
  3. A fabric node identity defined by a node ID Correct answer.
  4. A tenant-level private network

Explanation

Fabric membership is defined per switch by a fabric node identity, typically a node ID in the range assigned to leaf or spine roles. The APIC uses this identity to associate inventory, policy, and topology with the physical device. Tenants, bridge domains, and contracts are logical policy objects rather than switch identities.

Question 27Data Center Network Design

Which ACI policy object must be attached to an endpoint group before that EPG's endpoints can send traffic to a destination EPG?

  1. A VRF
  2. A bridge domain
  3. A VLAN pool
  4. A contract Correct answer.

Explanation

ACI enforces a whitelist model in which communication between EPGs requires a contract providing the filters and subjects. Without a contract, the fabric drops traffic between EPGs even when both are in the same bridge domain or VRF. Bridge domains, VRFs, and VLAN pools supply forwarding and placement, not permission.

Question 28Data Center Network Design

A designer needs to connect a Cisco Nexus 9000 leaf to a server that requires two independent 10 Gb links with active-active forwarding and no spanning tree blocking. Which design satisfies this requirement?

  1. A vPC domain with one member link on each peer leaf Correct answer.
  2. Two links in a standard PortChannel to a single leaf
  3. A single link configured as a routed port
  4. Two links to the same leaf in separate VLANs

Explanation

A vPC presents two peer leaf switches as one logical switch so a dual-homed server can forward on both links without STP blocking. A standard PortChannel terminates on one switch and offers no switch-level redundancy. Separate VLANs and a single routed port do not provide active-active multipathing.

Question 29Data Center Network Design

Which Cisco Nexus capability allows a single physical switch to be divided into multiple independent logical switches, each with its own configuration and management plane?

  1. Fabric Extender
  2. vPC domain
  3. Virtual Device Context Correct answer.
  4. VXLAN gateway

Explanation

Virtual Device Contexts partition one physical Nexus switch into separate logical devices, each with independent interfaces, routing, and administrative control. Fabric Extenders extend ports rather than partition the control plane. vPC and VXLAN gateway features address multipathing and overlay functions, not device virtualization.

Question 30Data Center Network Design

In an OTV design, which function does the overlay edge device perform for the extended Layer 2 domain?

  1. It floods all unknown unicast to every site permanently
  2. It performs dynamic MAC learning and advertises MAC reachability over the IP transport Correct answer.
  3. It maps VLANs to VRF instances at the edge
  4. It runs STP on the overlay to block redundant paths

Explanation

OTV edge devices learn MAC addresses on their site-facing interfaces and advertise reachability across the IP core so remote sites forward only toward the correct edge. The overlay does not run STP across the transport, which is a key benefit of OTV. Unknown unicast is handled through the control plane rather than permanent flooding.

Question 31Data Center Network Design

Which statement describes the role of the vPC peer-keepalive link in a Nexus vPC domain?

  1. It carries the heartbeat used to detect peer liveness and decide on peer-link failure handling Correct answer.
  2. It carries data-plane traffic between the peers during normal operation
  3. It synchronizes MAC address tables between the two peers
  4. It provides the loop-free alternate path for orphan ports

Explanation

The peer-keepalive link is a lightweight out-of-band heartbeat that lets each peer detect whether the other is alive. This liveness information determines whether a peer link failure results in continued forwarding or suspension of vPC member ports. It is not a data path and does not carry MAC synchronization.

Question 32Data Center Network Design

A designer is choosing a first-hop redundancy protocol for a pair of Nexus switches running vPC with servers dual-homed to both. Which approach best avoids an active/standby gateway bottleneck?

  1. HSRP with the virtual IP on the vPC primary peer only
  2. VRRP with preemption disabled on both peers
  3. The vPC anycast gateway feature with the same virtual MAC and IP on both peers Correct answer.
  4. A single static default gateway on one peer

Explanation

A vPC anycast gateway configures identical gateway IP and virtual MAC on both peers so each switch forwards locally for its dual-homed hosts. This removes the active/standby hairpin that classic HSRP or VRRP creates. Static gateways on one peer provide no redundancy.

Question 33Data Center Network Design

In a VXLAN EVPN fabric, which BGP address family carries the MAC and IP reachability information used for overlay forwarding?

  1. VPNv4
  2. IPv6 unicast
  3. IPv4 unicast
  4. Layer 2 VPN EVPN Correct answer.

Explanation

EVPN defines routes such as MAC/IP advertisement that distribute endpoint reachability across the overlay. This information is exchanged in the Layer 2 VPN EVPN address family, not in plain unicast or VPNv4 families. The underlay still uses IPv4 or IPv6 unicast routing separately.

Question 34Data Center Network Design

A designer must size a vPC peer link for a topology with many orphan ports and single-attached devices. Which traffic pattern drives the peer link bandwidth requirement?

  1. Traffic from orphan and single-homed hosts that must cross to the peer for forwarding Correct answer.
  2. Only control-plane keepalive messages
  3. Only broadcast and unknown unicast flooding
  4. Only management traffic destined to the peer switch

Explanation

Orphan and single-attached hosts have only one path, so their traffic may need to traverse the peer link to reach the rest of the fabric. This makes data-plane peer link capacity the dominant sizing factor in such designs. Control-plane and management traffic are negligible by comparison.

Question 35Data Center Network Design

In a Cisco ACI multi-pod design, which component connects pods and carries the fabric control-plane and data-plane traffic between them?

  1. The inter-pod network Correct answer.
  2. The APIC cluster nodes
  3. The spine switches within each pod
  4. The leaf access ports

Explanation

The inter-pod network provides the transport between pods, carrying VXLAN-encapsulated fabric traffic and the control-plane peering that makes the pods act as one fabric. APICs manage policy but do not forward tenant data. Spines and leaves are confined to their own pod.

Question 36Data Center Network Design

Which underlay routing approach is recommended for a VXLAN EVPN spine-leaf fabric where VTEPs must be reachable across all leaves?

  1. OSPF with all leaves in one area
  2. Static routes on every leaf to every other leaf
  3. IS-IS with a single level and no hierarchy
  4. eBGP with unique AS numbers per leaf and spines as route reflectors or peers Correct answer.

Explanation

eBGP underlays scale well because each leaf can use a unique AS number and peer only with spines, avoiding a full mesh. Spines commonly act as route reflectors for the overlay address family. Static routes and single-area designs become unmanageable at scale.

Question 37Data Center Network Design

A designer wants to stretch Layer 2 between two data centers over a Layer 3 WAN while keeping the overlay control plane MAC-learning efficient. Which technology uses MP-BGP EVPN for MAC reachability over the WAN?

  1. LISP
  2. OTV
  3. VXLAN with EVPN control plane Correct answer.
  4. FabricPath

Explanation

VXLAN with an EVPN control plane distributes MAC and IP reachability through BGP, avoiding reliance on data-plane flooding across the WAN. OTV uses its own MAC advertisement mechanism rather than EVPN. LISP and FabricPath address different problems and are not EVPN-based Layer 2 extension over IP.

Question 38Data Center Network Design

In an ACI tenant design, why is a bridge domain associated with exactly one VRF for Layer 3 routing?

  1. Because the VRF defines the routing table and isolation domain in which the bridge domain's subnets participate Correct answer.
  2. Because the VRF supplies the fabric node identity for the leaf
  3. Because the VRF provides the VLAN pool used for endpoint placement
  4. Because the VRF enforces contract filters between EPGs

Explanation

A VRF represents a Layer 3 routing and isolation context, so each bridge domain's subnet must belong to one such context. This association determines which routes are available to endpoints in that bridge domain. VLAN pools, contracts, and node identities are separate objects with different roles.

Question 39Data Center Network Design

A designer is evaluating a FabricPath core against a routed spine-leaf underlay. Which factor most favors the routed underlay for a new large fabric?

  1. The routed underlay supports more VLANs per link than FabricPath
  2. The routed underlay requires no IP address planning
  3. The routed underlay eliminates the need for any loop-prevention mechanism
  4. The routed underlay provides equal-cost multipathing without a proprietary control plane Correct answer.

Explanation

A routed spine-leaf underlay uses standard IP routing with ECMP, avoiding dependence on a proprietary Layer 2 control plane. Loop prevention still exists through routing protocol behavior and TTL, so it is not eliminated. IP address planning is actually a requirement of routed designs.

Question 40Data Center Network Design

Which mechanism prevents loops in a FabricPath fabric while allowing all links to forward traffic?

  1. Split horizon on the spine only
  2. A TTL-based loop mitigation combined with a link-state control plane that computes a tree Correct answer.
  3. Spanning Tree Protocol on all fabric links
  4. A single designated forwarder per VLAN

Explanation

FabricPath uses a link-state control plane to build a loop-free topology and relies on a TTL field in the encapsulated frame to mitigate transient loops. This lets all links forward rather than blocking them as STP does. STP and per-VLAN designated forwarders are not the FabricPath loop-prevention model.

Question 41Data Center Network Design

In a vPC design, which statement correctly describes how the vPC domain ID is used?

  1. It sets the VLAN range that the peer link carries
  2. It determines the OSPF area used by the peer switches
  3. It assigns the anycast gateway IP address
  4. It must be unique per vPC domain and is used to derive the vPC system MAC for the logical switch Correct answer.

Explanation

The vPC domain ID identifies the vPC domain and, with the system MAC, forms the identity that downstream devices see as one logical switch. It must be unique among vPC domains reachable in the same Layer 2 environment. It does not define VLAN ranges, routing areas, or gateway addresses.

Question 42Data Center Network Design

A designer is planning a VXLAN EVPN fabric and must decide how VTEP addresses are assigned. Which practice supports stable overlay operation?

  1. Use loopback interfaces with addresses advertised into the underlay routing protocol Correct answer.
  2. Use the anycast gateway address as the VTEP source
  3. Use DHCP-assigned addresses on each leaf for VTEP sourcing
  4. Use the physical front-panel interface addresses as VTEP source addresses

Explanation

Sourcing VXLAN tunnels from loopbacks that are advertised into the underlay ensures reachability and stability even if a physical link fails. Physical interface addresses and DHCP-assigned addresses are less resilient and harder to manage. The anycast gateway address serves hosts, not tunnel endpoints.

Question 43Data Center Network Design

In a Cisco ACI multi-site design, which element provides the control-plane and data-plane interconnection between separate ACI fabrics?

  1. The inter-site network with spine-to-spine connectivity Correct answer.
  2. A single APIC cluster shared by both sites
  3. An OTV edge device per site
  4. A vPC domain spanning both sites

Explanation

ACI multi-site connects separate fabrics through an inter-site network that links their spines, carrying VXLAN traffic and control-plane peering. Each site retains its own APIC cluster, and vPC does not span sites. OTV is a separate Layer 2 extension technology, not the multi-site fabric mechanism.

Question 44Data Center Network Design

A designer must provide Layer 3 connectivity between two ACI tenants while enforcing policy. Which design element is required to allow routing between their VRFs?

  1. A contract between EPGs in each tenant with the appropriate VRF leak or shared services configuration Correct answer.
  2. A shared bridge domain across both tenants
  3. A single VLAN pool assigned to both tenants
  4. A vPC domain shared by both tenants

Explanation

Tenants are isolated by default, so inter-tenant routing requires an explicit policy path such as a contract plus a shared-services or VRF-leak design. Bridge domains, VLAN pools, and vPC domains do not by themselves permit cross-tenant routing. The contract provides the permission while the VRF configuration provides the route path.

Question 45Data Center Network Design

In a VXLAN EVPN fabric, which EVPN route type is used to advertise the VTEP IP address associated with a VXLAN VNI for tunnel establishment?

  1. Type 3 inclusive multicast ethernet tag route Correct answer.
  2. Type 5 IP prefix route
  3. Type 2 MAC/IP advertisement
  4. Type 1 ethernet auto-discovery route

Explanation

The Type 3 inclusive multicast route advertises VTEP addresses for a VNI so remote VTEPs can build the flood list for broadcast, unknown unicast, and multicast traffic. Type 2 carries host MAC and IP reachability, and Type 5 carries IP prefix routes. Type 1 supports multihoming and mass withdrawal functions.

Question 46Data Center Network Design

A designer is evaluating ACI fabric access policies. Which object binds an endpoint group to a VLAN on a specific interface?

  1. A bridge domain subnet
  2. A VRF context
  3. A contract subject
  4. A static path binding on the EPG Correct answer.

Explanation

A static path binding associates an EPG with a specific interface and encapsulation VLAN, determining where endpoints are placed. Contracts, bridge domain subnets, and VRF contexts provide policy, gateway addressing, and routing isolation respectively. Only the static path binding ties the EPG to a port and VLAN.

Question 47Data Center Network Design

Which statement correctly describes the difference between a vPC peer link and a vPC member link?

  1. The peer link is always a routed link, while member links are always trunked
  2. Both carry identical traffic and are interchangeable
  3. The peer link connects the two vPC peers, while member links connect hosts or downstream devices to the peers Correct answer.
  4. The peer link connects hosts, while member links connect the two peers

Explanation

The peer link is the inter-switch connection that carries control-plane synchronization and cross-peer data traffic. Member links are the host-facing or downstream-facing ports that form the PortChannel toward a device. The two serve distinct roles and are not interchangeable.

Question 48Data Center Network Design

A designer needs to connect a Nexus Fabric Extender to its parent switch. Which statement describes the supported host-facing and fabric-facing connections?

  1. Both fabric and host interfaces connect only to servers
  2. Fabric interfaces connect to the parent switch, and host interfaces connect to servers or downstream devices Correct answer.
  3. Both fabric and host interfaces connect only to the parent switch
  4. Host interfaces connect to the parent switch, and fabric interfaces connect to servers

Explanation

On a Fabric Extender, fabric interfaces uplink to the parent switch and host interfaces face servers or downstream devices. The parent switch manages the FEX as a remote line card, so no local switching intelligence resides on the FEX. Reversing these roles is a common design error.

Question 49Data Center Network Design

In a Cisco Nexus vPC design, what happens to vPC member ports on the secondary peer when the peer link fails but the peer-keepalive link remains up?

  1. They are converted to routed ports automatically
  2. They are suspended to prevent split-brain forwarding Correct answer.
  3. They remain forwarding because the peer is confirmed alive
  4. They become orphan ports and continue forwarding

Explanation

If the peer link fails while the keepalive link stays up, each peer knows the other is alive, so the secondary peer suspends its vPC member ports to avoid a split-brain condition. The primary peer continues forwarding. Member ports are not converted to orphan or routed ports in this scenario.

Question 50Data Center Network Design

In a spine-leaf fabric with 32 leaves and 4 spines, which underlay design consideration most directly affects ECMP path diversity from each leaf?

  1. The number of equal-cost paths available through the spines Correct answer.
  2. The size of the MAC address table on each leaf
  3. The STP priority of each spine
  4. The number of VLANs configured on each leaf

Explanation

ECMP path diversity from a leaf depends on how many equal-cost next hops exist, which is governed by the number of spines and the routing design. VLAN count, STP priority, and MAC table size do not determine routed path diversity. A routed underlay with four spines can provide four equal-cost paths per leaf.