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IS-IS is an acronym for the Intermediate System-to-Intermediate System Routing Protocol. It is a link-state protocol that is used for routing data packets across a network. The Nokia IS-IS Routing Protocol is one of the most popular routing protocols in the networking industry, and with good reason. IS-IS is highly scalable, can support large network topologies, and is extensible.
Nokia IS-IS Routing Protocol is an industry-standard protocol used for routing in large-scale networks. It is often used in service provider networks, data centers, and enterprise networks. This protocol is known for its scalability, stability, and fast convergence. It is designed to support large networks with multiple levels of hierarchy, making it an ideal choice for complex network infrastructures.
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Nokia IS-IS Routing Protocol Sample Questions (Q17-Q22):
NEW QUESTION # 17
Which of the following definitions best describes route redistribution?
Answer: A
Explanation:
Route redistribution is the process of sharing routing information between different routing protocols or routing domains. For example, a router might redistribute routes learned via OSPF into a BGP routing table or vice versa. This enables routers to exchange routing information even when they are using different routing protocols.
NEW QUESTION # 18
Refer to the exhibit.
All routers in the diagram are running a link-state routing protocol. Before the link failure, all routers have operational adjacencies with each other and there is a BFD session between routers R1 and R3. After the link failure, which of the following affects the routing protocol's convergence time?
Answer: A
Explanation:
BFD (Bidirectional Forwarding Detection) is used to detect link failures quickly and helps improve convergence time in link-state routing protocols. The BFD session between routers R1 and R3 allows them to detect the failure of the link between them more quickly than the regular routing protocol hello timers. The transmit interval, receive interval, and multiplier settings determine how fast BFD detects a failure and triggers the routing protocol to converge, which directly impacts the convergence time.
NEW QUESTION # 19
A router is trying to establish an IS-IS adjacency with the DIS on a broadcast link. What event causes the adjacency to change from "Initializing" to "UP"?
Answer: B
Explanation:
The process of establishing an IS-IS adjacency on a broadcast link involves several steps, and the transition from the Initializing state to the UP state occurs when both routers exchange sufficient information to confirm they have a consistent view of the link-state database.
The CSNP (Complete Sequence Number PDU) packet is used to advertise the list of LSPs in the router's link-state database. When a router receives the first CSNP from the DIS (Designated Intermediate System) that lists the LSPs in the DIS's database, it indicates that the router has enough information to establish the adjacency and synchronize its database.
NEW QUESTION # 20
On a broadcast interface, an IS-IS router receives an LSP that is newer than the one on its database. Which of the following statements best describes the actions taken by the router as a consequence?
Answer: A
Explanation:
When an IS-IS router receives a newer LSP (Link-State PDU) than the one already in its database, it takes the following actions:
Updates its link-state database with the new LSP.
Acknowledges the LSP with a PSNP (Partial Sequence Number PDU), which is sent to the router that originated the LSP, confirming the receipt of the newer LSP.
Floods a copy of the updated LSP to its neighbors on other interfaces to ensure all routers in the network have the updated topology information.
NEW QUESTION # 21
Which of the following is NOT a function of the control plane a router?
Answer: D
Explanation:
The data plane (or forwarding plane) is responsible for actually forwarding the data packets. It uses the information stored in the forwarding table to determine how to move packets from one interface to another toward their destination.
NEW QUESTION # 22
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