Distance-Vector vs. Link-State — Identify the True Statements Consider the following statements: Link-state sends its complete routing table out all active interfaces on periodic intervals. Distance-vector sends its complete routing table out all active interfaces on periodic intervals. Link-state sends updates containing the state of its own links to all routers in the internetwork. Distance-vector sends updates containing only the state of its own links to all routers in the internetwork. Which combination is correct?

Introduction / Context:
Routing protocols differ in how they disseminate information. Distance-vector protocols share entire tables periodically, while link-state protocols advertise link-state information (LSAs) and build a full topology locally. Distinguishing these behaviors is vital for predicting convergence and bandwidth use.

Given Data / Assumptions:

• Distance-vector examples: RIP, IGRP.
• Link-state examples: OSPF, IS-IS.
• Periodic vs. event-driven updates must be understood correctly.

Concept / Approach:
Statement 2 is true: distance-vector protocols periodically send their routing tables (in RIP, every 30 seconds). Statement 3 is true: link-state protocols flood link-state advertisements about their own links; routers then compute shortest paths using algorithms like Dijkstra. Statement 1 is false because link-state does not send full routing tables periodically; instead, LSAs are sent on changes and at refresh intervals, not wholesale tables. Statement 4 is false for distance-vector because DV does not send only link states; it sends distance vectors (routes and metrics), not raw link-state data to all routers.

Step-by-Step Solution:
Classify each statement as DV or LS.Mark 2 (DV periodic full table) as true.Mark 3 (LSA flooding of link states) as true.Mark 1 and 4 as false based on protocol mechanics.Select “2 and 3 only.”

Verification / Alternative check:
Protocol RFCs and textbooks confirm DV periodic timers and LS flooding mechanisms with separate SPF computations.

Why Other Options Are Wrong:

• 1 only: Misstates link-state behavior.
• 3 only: Ignores the truth of 2.
• None: Incorrect because 2 and 3 are true.
• 1 and 4: Both are false.

Common Pitfalls:
Assuming link-state sends “routing tables”; it sends LSAs, not computed final routes.

Final Answer:
2 and 3 only