CCIE Enterprise case studies
CCIE Enterprise · Put your knowledge to work in context.
CCIE Enterprise Infrastructure - often shortened to CCIE EI and grouped under the wider CCIE Enterprise label - is Cisco's expert-level certification track for network engineers who design, deploy, operate, and troubleshoot large enterprise networks. Unlike associate and professional certifications that lean heavily on multiple-choice assessment, the CCIE track is built around a hands-on lab exam in which candidates configure and diagnose live technologies under time pressure, after first clearing a qualifying written exam. The CCIE Enterprise case studies are 5 cases and about 4,594 words.
1HSRP, STP and the Maintenance Window That Wasn't
Two Catalyst 9500 distribution switches, D1 and D2, serve four access stacks in a campus of about 3,000 users. HSRPv2 runs per VLAN: D1 is active for VLANs 10 and 20, D2 for VLANs 30 and 40, with preempt enabled on both.
938 words, about 5 min2Voice Pinned to a Brownout MPLS Circuit in Catalyst SD-WAN
A Catalyst SD-WAN fabric has 45 branches, each with an MPLS TLOC (color mpls) and a broadband TLOC (color biz-internet) on a single cEdge. Voice is marked DSCP EF and must stay under 150 ms latency and 1 percent loss.
908 words, about 5 min3OSPF Backdoor Beats the L3VPN
PE1 and PE2 carry VRF CUST across an MPLS core. CE-A attaches to PE1 and CE-B to PE2; both PE-CE pairs run OSPF area 0 and the PEs redistribute OSPF into MP-BGP with a domain ID set.
771 words, about 4 min4Certificate Renewal Breaks 802.1X and Lands Laptops in Quarantine
A campus of about 6,000 endpoints runs Cisco ISE with 802.1X on wired access ports in multi-auth mode. Both dot1x and MAB are enabled on the port; voice is on a critical VLAN.
1,017 words, about 5 min5A Netmiko Push That Was Not Idempotent
A team maintains 60 Catalyst 9300 switches. A Python script renders a Jinja2 template from a YAML file of intended state and pushes it with Netmiko send config set .
960 words, about 5 min