CS 672

1

Summer 2003

Quiz 3

• Q1) Briefly describe• IP control plane is composed of following protocols (list 2 to 3)?• IP control plane provides information used for building RIB/FIB (True or False)?

• Q2) Briefly describe• What is the main function of IP forwarding plane?• What is the outcome of forwarding decision?

• Q3) Briefly describe• Route cache hit ratio depends upon (list 2 to 3)?• A lower hit ratio means cache entries need to be invalidated more frequently (True or False)?

• Q4) Briefly describe • How does a FIB differ from a route cache (list 3 items)?

CS 672

2

Summer 2003

Quiz 3

• Q5) Briefly describe• What is a forwarding equivalence class (FEC) ?

• Q6) Briefly describe• List two common label stack operations performed by an LSR?• In Downstream Unsolicited (DU) mode, the upstream LSR asks for a FEC to Label binding (True or False)?

• Q7) Briefly describe• An hop-by-hop routed LSP traverses a path taken by destination-based (IGP) routing (True or False)?• An explicitly routed LSP traverses a path that can be different that IGP path (True or False)?

• Q8) Briefly describe:• What is the penultimate hop popping?• What is the main benefit (use) of penultimate hop popping?

CS 672

3

Summer 2003

Quiz 3

• Q9) Briefly describe• How is label carried on a label-controlled (LC) ATM interface ?• How is label carried on an Ethernet interface?

• Q10) Briefly describe• ATM-LSRs use global (system wide) label space (True or false)?• Frame-mode LSRs use per interface label space (True or false)?