Nokia NRS II Composite (IS-IS) study plan

Diagram the IS-IS packet types (IIH, LSP, CSNP, PSNP) and label which PDU carries which TLVs and at which level

Trace the three-way adjacency handshake step by step and state exactly which TLVs (point-to-point adjacency, protocols supported, area address) must match or mismatch for each outcome

Explain DIS election and pseudonode LSP creation on a broadcast LAN, including why there is no backup DIS

Compare Level 1, Level 2 and Level 1-2 interface behaviour and predict which adjacencies form on each pairing

Describe the LSP ID structure (system ID, pseudonode ID, fragment number) and the role of the remaining lifetime, sequence number and checksum

Walk through the CSNP/PSNP database synchronisation process on point-to-point and broadcast links and identify who sends what

Explain the SRM/SSN flag mechanism on Nokia SR OS and how it drives flooding and acknowledgement

List the ordered steps of the SPF calculation, including the two-pass behaviour when a router is attached to multiple areas

Distinguish internal, external and inter-area route preference and describe how route preference values break ties in SR OS

Construct valid NSAP and NET addresses and verify the system ID length, area address and AFI rules

Design a two-area topology and justify which links are Level 1, Level 2 or Level 1-2

Explain how Level 1 routers reach other areas via the closest attached bit and default route, and where route leaking changes that

Configure and verify route leaking between levels on SR OS and state when it is appropriate

Compare narrow and wide metric encoding, state the maximum values and explain when wide metrics are mandatory

Configure metric styles and per-level interface metrics on SR OS and predict the resulting path selection

Explain how TE extensions (traffic engineering TLVs, administrative groups, bandwidth) are carried and which router role originates them

Describe multi-topology IS-IS, the MT TLVs and how IPv4 and IPv6 topologies are kept separate

Configure IPv6 and multi-topology on SR OS and verify separate SPF trees

Build a working SR OS IS-IS configuration from scratch covering area, level capability, interface and authentication

Use show router isis adjacency, database, spf-log and interface commands to verify each layer of protocol operation

Trigger and diagnose at least three deliberate failures: MTU mismatch, authentication mismatch and area mismatch

Apply and verify LSP pacing, hello timers and overload bit behaviour

Reproduce a fragmented LSP scenario and explain fragment zero rules and the overload bit's effect on SPF

Analyse an SPF log and correlate a topology change with the recomputed routes

Verify database synchronisation after a link flap using CSNP/PSNP counters

Explain prefix attributes, route tags and how SR OS applies route preference to IS-IS versus other protocols

Re-derive the adjacency state machine from memory and correct any gaps against your week 1 notes

Explain Graceful Restart and BFD interaction with IS-IS adjacencies at a conceptual level

Compare IS-IS area boundary behaviour with OSPF to lock in the differences that exam questions exploit

Review all domain 1, 3 and 6 objectives and write a short summary of each

Run a timed mixed-topic review covering addressing, metrics, IPv6/MT and SR OS operations

Re-perform the week 5 failure scenarios without notes and confirm correct diagnosis each time

Consolidate all weak points from weeks 1-7 into a single revision sheet

Verify command syntax recall for the ten most-used SR OS IS-IS show and config commands