Project ForgeConsider the following statements about the functionality of an IP based router.
I. A router does not modify the IP packets during forwarding. II. It is not necessary for a router to implement any routing protocol. III. A router should reassemble IP fragments if the MTU of the outgoing link is larger than the size of the incoming IP packet.
Which of the above statements is/are TRUE?
- AI and II only
- BI only
- CII and III only
- II only
Explanation
I is FALSE: routers DO modify IP packets during forwarding (decrementing TTL, recomputing the header checksum, rewriting MAC addresses at the link layer). II is TRUE: a router can use purely static routes configured by an administrator, with no dynamic routing protocol running at all. III is FALSE: routers never reassemble IP fragments (only the final destination host does); routers only fragment further when the OUTGOING link's MTU is SMALLER than the packet, not larger. So II only.
Source: GATE CS 2020 (2020)
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