What is required for Loose Source Routing?

• A. Requires you to designate SOME of the routers that must be traversed
• B. All routers along route must be designated
• C. No routers need to be designated
• D. Only the final destination is specified

Answer: (A)

Loose Source Routing lets the sender influence the path by listing a subset of routers that must be visited, while still allowing other hops to be chosen by the network in between those specified routers. In other words, you designate some routers that must be traversed, but you don’t have to fix every hop. This is what differentiates it from Strict Source Routing, where the exact path must be followed with no deviation, and from no source routing at all, where the network handles all routing decisions normally. If you only specify the final destination, you’re not enforcing any intermediate router visits, which isn’t how Loose Source Routing works.