UGC NET CSE | December 2023 | Part 2 | Question: 90

Question

Given below are two statements:

$\text{Statement I}$: In datagram networks - routers hold state information about connections
$\text{Statement II}$: In virtual circuit network- each virtual circuit requires router table space per connection

In the light of the above statements, choose the most appropriate answer from the options given below:

• A. Both $\text{Statement I}$ and $\text{Statement II}$ are correct
• B. Both $\text{Statement I}$ and $\text{Statement II}$ are incorrect
• C. $\text{Statement I}$ is correct but $\text{Statement II}$ is incorrect
• D. $\text{Statement I}$ is incorrect but $\text{Statement II}$ is correct

Answer 1

• Statement (I) — wrong. In datagram (pure packet-switched) networks like the Internet, routers forward each packet independently using routing tables — they do not keep per-connection state (no per-flow connection table).

• Statement (II) — correct. In virtual-circuit packet switching (and in circuit switching), a path is established and routers/switches maintain per-connection state (virtual-circuit identifiers, entry in a forwarding table) for each connection.