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Computer Networks Routing Algorithms

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Questions and Answers

What is the primary purpose of hierarchical routing?

To prioritize traffic in a network

To aggregate routers into regions, called autonomous systems (correct)

To reduce the number of nodes in a network

To improve the scalability of a network

What is the primary characteristic of distance-vector algorithms?

The algorithm is used primarily for inter-AS routing

The algorithm is used primarily for intra-AS routing

Each node maintains a complete map of the network topology

Each node computes its own routing table based on information from its neighbors (correct)

What is the primary advantage of link-state algorithms over distance-vector algorithms?

They are more sensitive to topology changes

They are faster to converge

They are more scalable

They are less prone to routing loops (correct)

What is the primary function of intra-AS routing protocols?

To route traffic within a single autonomous system Signup and view all the answers

What is the primary function of inter-AS routing protocols?

To route traffic between different autonomous systems Signup and view all the answers

What is the primary purpose of BGP in inter-AS routing?

To provide subnet reachability information between autonomous systems Signup and view all the answers

What is the primary function of BGP in inter-AS routing?

To advertise the existence of a subnet to the rest of the Internet Signup and view all the answers

What type of protocol is BGP?

Path Vector protocol Signup and view all the answers

When AS3 advertises a prefix to AS1, what is AS3 promising?

That it will forward datagrams towards the advertised prefix Signup and view all the answers

What is the purpose of a BGP session?

To exchange BGP messages between two BGP routers (peers) Signup and view all the answers

How do entries get into the forwarding table in a router?

Through the routing algorithms and local forwarding table Signup and view all the answers

What is the primary advantage of the IPv6 datagram header format?

It facilitates faster processing and forwarding of header changes. Signup and view all the answers

What is the main challenge in transitioning from IPv4 to IPv6?

Operating a network with mixed IPv4 and IPv6 routers. Signup and view all the answers

What is the purpose of tunneling in IPv6?

To carry IPv6 datagrams as payload in IPv4 datagrams. Signup and view all the answers

What determines the end-to-end path through a network in routing?

Routing algorithm. Signup and view all the answers

What is the set of links represented by in the graph abstraction?

E = set of links. Signup and view all the answers

What is the cost of a path in the graph abstraction calculated as?

The sum of the costs of all links in the path. Signup and view all the answers