Choosing a Routing Protocol for IPv4 and VLSM Transition

As part of a transition from a static to a dynamic routing protocol on an organization's internal network, the routing protocol must support IPv4 and VLSM.

Based on those requirements, which of the following should the network administrator use? (Choose two.)

A.

OSPF

B.

IS-IS

C.

RIPv1

D.

BGP

E.

VRRP.

AB.

In order to transition from a static to a dynamic routing protocol on an organization's internal network, the routing protocol must support IPv4 and Variable Length Subnet Masking (VLSM).

Option A: OSPF (Open Shortest Path First) is a dynamic routing protocol that supports both IPv4 and VLSM. OSPF uses a link-state algorithm to determine the best path for data packets to reach their destination. OSPF is widely used in large enterprise networks due to its scalability and ability to support multiple paths to a destination.

Option B: IS-IS (Intermediate System to Intermediate System) is another dynamic routing protocol that supports both IPv4 and VLSM. IS-IS is commonly used in Service Provider networks and is known for its fast convergence time.

Option C: RIPv1 (Routing Information Protocol version 1) is an outdated and insecure dynamic routing protocol that does not support VLSM. RIPv1 is limited to classful routing, which means it does not support subnet masks of different lengths within the same network.

Option D: BGP (Border Gateway Protocol) is an external routing protocol that is used between different autonomous systems on the internet. BGP does not support VLSM and is not suitable for internal network routing.

Option E: VRRP (Virtual Router Redundancy Protocol) is not a routing protocol, but rather a protocol that allows multiple routers to participate in a virtual router that shares a single IP address. VRRP does not support VLSM.

Based on the requirements of supporting IPv4 and VLSM, the two options that are suitable for the network administrator to use are OSPF and IS-IS. Therefore, the correct answers are A and B.