Wireless Mobile Networking - Ad-hoc Networks 2

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Questions and Answers

What is the main disadvantage of DSDV in terms of route updates?

It necessitates a full dump update periodically. (correct)
It requires a constant connection to function properly.
It can only operate in small static networks.
It relies on a single node for updating routes.

How does DSDV handle link breakage in a network?

By broadcasting the link breakage to neighboring nodes. (correct)
By assuming that the link is still active.
By establishing a new route immediately.
By ignoring the link breakage until the next update cycle.

In what type of network is DSDV most effective?

Network environments with high bandwidth requirements.
Static wireless networks without mobility.
Ad-hoc networks with small populations of mobile nodes. (correct)
Large-scale enterprise networks with fixed nodes.

What happens when the topology of a network changes in DSDV?

The network becomes unstable until updates propagate. (D) Signup and view all the answers

What is a characteristic of DSDV's approach to connectivity information?

It requires periodic updates throughout the network. (B) Signup and view all the answers

What is a key characteristic of Table Driven/Proactive Routing protocols?

They maintain the global topology information in the form of tables in every node. (C) Signup and view all the answers

What problem is associated with the DSDV routing protocol?

Count to infinity problem. (C) Signup and view all the answers

How are routing tables established in the DSDV protocol?

They are populated through a sequence of route advertisement messages. (B) Signup and view all the answers

What occurs during DSDV route maintenance?

Link breakages are managed by sending immediate update messages. (B) Signup and view all the answers

Which statement best describes DSDV's use of sequence numbers?

They are utilized to prevent routing loops and ensure fresh routes. (C) Signup and view all the answers

What action does node D take upon its arrival in the network?

Node D broadcasts its existence. (C) Signup and view all the answers

How does node C respond when it detects the link breakage involving node D?

It sets the distance to node D as infinity. (D) Signup and view all the answers

What should node C do when it receives an out-of-date full dump from node B?

Ignore node B's dump and keep its current sequence number. (D) Signup and view all the answers

Which node initiates the full dump process upon learning of the new node D?

Node C broadcasts the full dump immediately. (C) Signup and view all the answers

Which of the following statements accurately describes the sequence number function in DSDV?

Higher sequence numbers indicate more recent information. (D) Signup and view all the answers

Flashcards

Link Breakage Broadcast

When a wireless connection between two nodes is lost, DSDV requires a broadcast message to inform the network. This message is sent by the node that detected the broken link, informing all its neighbors.

Periodic Full Updates

DSDV periodically sends out full updates about the entire network topology, regardless of whether there have been changes. This can be inefficient, especially in large networks with frequent changes.

Unstable Network During Updates

The entire network has to wait until all the update packets have been transmitted and received before resuming normal operation. This can lead to temporary disruptions and delays in communication.

DSDV Suitability for Small Networks

DSDV works well in small networks where the number of nodes is limited and the network topology doesn't change frequently. It is ideal for small groups of mobile devices in relatively stable environments.