Designated Router for Broadcast Networks
Question
Which two routing protocols make use a designated router, or pseudo node, to represent a broadcast network? (Choose two.)
Answers
Explanations
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The two routing protocols that make use of a designated router, or pseudo node, to represent a broadcast network are OSPF and IS-IS.
OSPF (Open Shortest Path First) is a link-state routing protocol that is commonly used in large enterprise networks. OSPF uses a hierarchical structure to organize the network into areas, which reduces the amount of routing information that needs to be exchanged between routers. Within each area, a designated router (DR) is elected to represent the network, and a backup designated router (BDR) is also elected in case the DR fails. The DR and BDR are responsible for sending and receiving OSPF messages on behalf of the other routers in the network. This reduces the amount of OSPF traffic that needs to be sent and received by every router in the network, which helps to improve network performance.
IS-IS (Intermediate System to Intermediate System) is another link-state routing protocol that is commonly used in large enterprise networks. Like OSPF, IS-IS uses a hierarchical structure to organize the network into areas. Within each area, a designated intermediate system (DIS) is elected to represent the network, and a backup designated intermediate system (BDIS) is also elected in case the DIS fails. The DIS and BDIS are responsible for sending and receiving IS-IS messages on behalf of the other routers in the network. This reduces the amount of IS-IS traffic that needs to be sent and received by every router in the network, which helps to improve network performance.
BGP (Border Gateway Protocol) is a path-vector routing protocol that is commonly used in large service provider networks and the Internet. BGP does not use a designated router to represent a broadcast network. Instead, BGP routers exchange routing information with each other using a peer-to-peer model.
MPLS (Multiprotocol Label Switching) is not a routing protocol, but rather a technique for forwarding packets through a network. MPLS does not use a designated router to represent a broadcast network. Instead, MPLS routers use labels to forward packets through the network based on predefined paths.
