0 — Test 345

Correct Answer: C. C. Mapped address
Explanation: A mapped IPv6 address contains the IPv4 address in its last 32-bits and is preceded by 16 1s and 80 0s. It can be used to translate an IPv6 address to an IPv4 address.

Correct Answer: D. D. The ipv6 flow label is considered
Explanation: In the header translation procedure, first the IPv6 mapped address is changed to an IPv4 address by extracting the rightmost 32bits, then the value of the IPv6 priority field is discarded, and finally the ToS field in the IPv4 header is set to zero. IPv6 flow label is ignored in the procedure.

Correct Answer: B. B. The use of variable length subnet masks is permitted
Explanation: Classful routing means that all hosts in the internetwork use the same mask. Classless routing means that you can use Variable Length Subnet Masks (VLSMs) and can also support discontinuous networking.

Correct Answer: D. D. It describes when a router sets the metric for a downed link to infinity
Explanation: When a network goes down, the distance-vector routing protocol initiates route poisoning by advertising the network with a metric of 16, or unreachable.

Correct Answer: C. C. It has the same timers as ripv1
Explanation: RIPv2 is pretty much just like RIPv1. It has the same administrative distance and timers and is configured just like RIPv1.

Correct Answer: A. A. When a new layer 2-only switch is added to the network
Explanation: Multiple routing protocols are required only when we need to migrate from one routing protocol to another, or when we are using routers from multiple vendors, or when there are host-based routers from multiple vendors. Routing is not a layer-2 function so we don’t require multiple routing protocols when new layer-2 switch is added.

Correct Answer: C. C. Ripv2 and ip eigrp
Explanation: OSPF stands for Open Shortest Path First. It is a Link state routing protocol. IP EIGRP and RIPv2 can be redistributed into OSPF by a Cisco router.

Correct Answer: B. B. Routing feedback
Explanation: Routing feedback is an anomaly in which the routing protocols go back and forth between one route and another. Routing feedback is a reason for avoiding doing route redistribution on two routers between the same two routing domains.

Correct Answer: B. B. Sources of routing information
Explanation: Sources of routing information is the administrative distance rank. It is used by routers to select the best path when there are different routes to the same destination. It’s used only two different routing protocols are being used.

Correct Answer: C. C. Ripv2
Explanation: Neighbor adjacency refers to the formal handshake performed by neighboring routers. It is to be done before the router share any routing information. RIP V2 maintains neighbor adjacencies.