JNCIS-SP study plan

Configure a four-router lab with eBGP and an iBGP full mesh over loopbacks and confirm every session reaches Established

Write out the BGP best-path selection order from weight through router-ID from memory and label each step's tie-break condition

Change one attribute at a time (local-preference, AS-path prepend, MED, origin, next hop) and record which route wins after each change

Diagnose an iBGP next-hop unreachable failure and repair it using next-hop-self plus an underlying route to the peer loopback

Explain the difference between eBGP and iBGP attribute propagation by predicting before testing three scenarios

Build a route-reflection topology with two redundant reflectors and four clients and verify loop prevention using cluster-ID and originator-ID

Configure a two-member confederation and compare the AS-path an external peer sees against the reflector design

Tag routes with standard and large communities and match those communities in a policy to set local-preference

Write an import policy and an export policy that filter by prefix-list and by community in combination

Contrast route reflection and confederations on policy application points inside the AS

Build a three-area OSPF domain with two ABRs and verify which LSA types appear in each router's link-state database

Configure a stub, a totally stubby, and an NSSA area and record the LSA types each area's routers receive and block

Set interface costs and reference bandwidth and verify the resulting intra-area and inter-area metrics

Redistribute a static route into OSPF as both E1 and E2 and compare the metric each receiver computes

Configure MD5 and SHA authentication on a broadcast segment and confirm the adjacency fails when keys mismatch

Tune hello and dead intervals and measure adjacency loss detection time for each setting

Enable BFD for OSPF and measure failover time against the same failure without BFD

Document the Junos route preference order between OSPF, iBGP, eBGP, and static routes and verify each with a live overlap

Verify that an iBGP-learned prefix is preferred over an OSPF-learned copy of the same prefix and explain why

Enable LDP across a four-router core and verify label bindings in both the label information base and the forwarding table

Trace a labeled packet across two chained LSPs and explain penultimate-hop popping with an annotated label stack

Signal an RSVP-TE tunnel with a bandwidth constraint and confirm it is admitted and recorded in the traffic engineering database

Compare LDP reconvergence against RSVP-TE make-before-break on a single link failure

Configure and verify a label stack of two or more labels and identify which label each router swaps or pops

Configure VRFs with unique route distinguishers and verify each per-VRF routing table is isolated

Bring up MP-BGP VPNv4 sessions between PE routers and confirm VPN labels are exchanged and installed

Match route targets on import and export for both an any-to-any and a hub-and-spoke design

Verify end-to-end CE-to-CE connectivity and identify both the inner VPN label and the outer transport label in the stack

Configure IS-IS level 1 and level 2 with NET addressing and verify adjacency levels and designated intermediate system election

Compare narrow, wide, and transition metrics and confirm the metric values carried in each case

Tune level-2 to level-1 leaking and the attached-bit default route and verify what level-1 routers install

Configure 802.1Q trunking, an LACP link aggregation group, and RSTP on the provider edge and verify topology convergence after a failure

Distinguish a single LAG member failing from a whole LAG failing and record the STP and LACP response to each

Write and test a routing policy chain that filters prefixes, sets communities, and applies a preference, verified against ten crafted test prefixes

Configure graceful restart and nonstop routing and verify forwarding survives a control-plane restart

Enable BFD for BGP and measure session teardown time against the default hold timer

Run a timed mixed practice set across all six domains and classify every miss by domain and root cause

Re-drill the two weakest domains with a focused thirty-minute lab rebuild each