4A0-112

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The dumps for 4A0-112 exam was last updated on Apr 04,2026 .

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Question#1

When multiple routing protocols offer a route for the same prefix, what part of the router is in charge of deciding which route to make active?

A. The routing information base (RIB)

B. The routing table manager (RTM)

C. The equal cost multipath configuration

D. The forwarding information base (FIB)

Explanation:
The routing table manager (RTM) is responsible for selecting the best route when multiple routing protocols provide a route for the same destination prefix. It makes the decision on which route to add to the routing table based on the administrative distance, metric, and other criteria.

Question#2

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

A. Both detect duplicate MAC address assignments.

B. Both detect duplicate IP address assignments.

C. Both resolve a host device's MAC address using its IP address.

D. Both resolve a host device's IP address using its MAC address.

Explanation:
ARP for IPv4 and Neighbor Discovery Protocol (NDP) for IPv6 are both used to map a device's IP address to its MAC address. This is essential for communication within a local network.
ARP is used in IPv4 networks, and NDP performs a similar function in IPv6 networks, ensuring devices can communicate effectively on the same network segment.

Question#3

A routing domain uses a link-state routing protocol.
Which of the following would NOT be an advantage of dividing the entire routing domain into areas?

A. Detailed topology information is only shared among routers within the same area, thus reducing the complexity of the SPF calculation.

B. Route tables can be reduced by summarizing the IP prefixes advertised between areas.

C. Less-capable routers can be isolated from having to keep track of IP prefixes that are external to the local routing domain.

D. Fewer routers are required to handle the same amount of traffic, as compared to a single-area domain.

Explanation:
Dividing a domain into areas typically does not reduce the number of routers needed to handle traffic. It is more focused on improving scalability, reducing the size of routing tables, and limiting the scope of SPF calculations, but it doesn't inherently reduce the number of routers required.

Question#4

Which of the following definitions best describes route redistribution?

A. It is the process of deciding at line-rate speed which packets will be dropped and which ones will be forwarded.

B. 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.

C. It is the process of passing routing information from one routing domain to another, which usually means from one routing protocol to another.

D. 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.

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.

Question#5

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?

A. Calculating the shortest-path next hop for each known IP prefix.

B. 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.

C. Installing two entries in the FIB for IP prefixes, one active and one in standby mode.

D. Enabling the router to locally repair the active path to an IP prefix in case of failure.

Explanation:

Exam Code: 4A0-112 Q & A: 40 Q&As Updated: Apr 04,2026

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Exam Code: 4A0-112
Q & A: 40 Q&As
Updated: Apr 04,2026

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