Free Nokia IS-IS Routing Protocol Exam 4A0-112 Exam Practice Test

What do the address resolution protocol (ARP) for IPv4 and the neighbor discovery procedures for IPv6 have in common?

• Both detect duplicate MAC address assignments.
• Both detect duplicate IP address assignments.
• Both resolve a host device's MAC address using its IP address.
• Both resolve a host device's IP address using its MAC address.

Which of the following definitions best describes route redistribution?

• It is the process of deciding at line-rate speed which packets will be dropped and which ones will be forwarded.
• It is the process of redirecting packets to be processed by an intermediate network function before allowing them to be forwarded to their intended final destination.
• It is the process of passing routing information from one routing domain to another, which usually means from one routing protocol to another.
• It is the process of controlling which route advertisements received from routing peers are accepted and/or deciding which locally known prefixes are advertised to routing peers.

Two IS-IS routers are exchanging Hello packets. One is configured to use authentication and the other is not. Which of the following statements is TRUE?

• An adjacency will be established with authentication using the default parameters defined for IS- IS routers.
• The two routers will negotiate the authentication parameters and the establish an adjacency.
• An adjacency will be established without authentication.
• An adjacency will not be established.

Which of the following is a valid alternative representation of the IPv6 address 2001:0da8:0000:0000:0024:0000:4ab9:0300?

• 2001:0da8::0024:0000:4ab9:03
• 2001:da8::0:24::4ab9:300
• 2001:da8::24::4ab9:300
• 2001:da8::24:0:4ab9:300

A router running a link-state routing protocol detects that one of its neighbors is no longer connected to it. The router generates a new link-state advertisement to inform other routers of the topology change. Which of the following is NOT an action that is triggered by this event?

• If a router receives the new link-state advertisement, it acknowledges it, stores it, and forwards it to its own neighbors.
• If a router receives multiple copies of the new link-state advertisement, it will simply ignore all copies received after the first one.
• Every router that receives the new link-state advertisement updates its age field before forwarding it.
• Every router that receives the new link-state advertisement runs the SPF algorithm to recalculate its shortest-path tree and its forwarding database.

A routing domain is using a single-area link-state routing protocol. Which of the following is NOT information that a router can share with other routers in the domain using protocol-specific messages?

• The IP prefixes of subnets directly attached to the router.
• IP prefixes known by the router because it is running ad additional routing protocol.
• A copy of the local routing table.
• The local router ID and the router IDs of neighboring routers.

An IS-IS router receives a CSNP that references an older LSP than the one in its local database. What action is taken?

• The router sends a copy of the referenced LSP from its database to its neighbor.
• The router sends a CSNP to its neighbor describing the newer LSPs in its database.
• The router updates its database with the new sequence number and floods a copy of the LSP to its other neighbors.
• The router sends a PSNP to its neighbor to request a copy of the LSP.

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?

• The router sends back a copy of the LSP from its database to its neighbor.
• The router updates its database with the LSP and floods a copy to its neighbors on other interfaces.
• The router updated its database with the LSP, acknowledges the LSP with a PSNP, and floods a copy to its neighbors on other interfaces.
• The router updates its database with the LSP and acknowledges it with a PSNP.

A series of actions are triggered on a router as a result of enabling both loopfree-alternate for a link- state routing protocol and ip-fast-reroute. Which of the following is NOT one of those actions?

• Calculating the shortest-path next hop for each known IP prefix.
• Calculating a backup next hop for each known IP prefix, if it exists, that would not create a routing loop if used without informing other routers.
• Installing two entries in the FIB for IP prefixes, one active and one in standby mode.
• Enabling the router to locally repair the active path to an IP prefix in case of failure.

For a link-state routing protocol, which of the following statements about link-state updates is FALSE?

• When a link-state update reaches its maximum age on a router, the router will flood that update to its neighbors.
• When a router detects that a link-state update has reached its maximum age, it will request a new update from the source router.
• Aging helps ensure that routers that are no longer part of the topology will eventually get removed from the link-state database.
• The age value is updated as the link-state update is flooded throughout the network and when it is in the link-state database