Link state routing (OSPF) in Computer Networks - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to identify the protocol used by OSPF.

Computer Networks

OSPF uses the [1] protocol to exchange routing information.

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ABGP

BLink State

CDistance Vector

DRIP

Attempts:

3 left

💡 Hint

Common Mistakes

Confusing OSPF with RIP which is a distance vector protocol.

Thinking OSPF uses BGP protocol.

OSPF is a link state routing protocol, meaning it uses link state information to build a complete map of the network.

2fill in blank

medium

Complete the code to specify the algorithm OSPF uses to calculate shortest paths.

Computer Networks

OSPF uses the [1] algorithm to compute the shortest path tree.

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ABellman-Ford

BFloyd-Warshall

CPrim

DDijkstra

Attempts:

3 left

💡 Hint

Common Mistakes

Confusing Dijkstra with Bellman-Ford which is used in distance vector protocols.

Thinking OSPF uses Prim's algorithm which is for minimum spanning trees.

OSPF uses Dijkstra's algorithm to calculate the shortest path tree from each router to all other routers.

3fill in blank

hard

Fix the error in the statement about OSPF packet types.

Computer Networks

OSPF sends [1] packets to discover neighbors and exchange routing information.

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ARequest

BUpdate

CHello

DAcknowledgment

Attempts:

3 left

💡 Hint

Common Mistakes

Confusing Hello packets with Update packets used in RIP.

Thinking Request packets are used for neighbor discovery.

OSPF uses Hello packets to discover and maintain neighbor relationships.

4fill in blank

hard

Fill both blanks to complete the OSPF router state description.

Computer Networks

A router in OSPF maintains a [1] database and uses [2] to calculate routes.

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Alink-state

Bdistance vector

CDijkstra's algorithm

DBellman-Ford algorithm

Attempts:

3 left

💡 Hint

Common Mistakes

Mixing distance vector concepts with OSPF's link-state approach.

Using Bellman-Ford algorithm which is not used by OSPF.

OSPF routers keep a link-state database and use Dijkstra's algorithm to compute the best paths.

5fill in blank

hard

Fill all three blanks to complete the OSPF packet description.

Computer Networks

OSPF packets include a [1] header, [2] packets for neighbor discovery, and [3] packets to update routing information.

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Acommon

BHello

CLink State Advertisement

DDistance Vector

Attempts:

3 left

💡 Hint

Common Mistakes

Confusing Link State Advertisements with Distance Vector packets.

Thinking Hello packets carry routing updates.

OSPF packets have a common header, use Hello packets to discover neighbors, and Link State Advertisements to share routing info.