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1 EEC173A/ECS152A Chuah 1.Multiple-Choice Questions (a)Which of the following is/are false? i.Presentation and session layers are not part of the Internet protocol stack. ii.Most packet-switched networks cannot provide any performance guarantees for bandwidth or packet delays. iii.In a packet switched networks, the TTL field of the packet is incremented each time it passes through a router. iv.Layering is important because it allows information-sharing across layers and all protocols. (b)In classless inter-domain routing (CIDR), network portion of the address is i.8 bits long ii.16 bits long iii.24 bits long iv.Of arbitrary length 2.Short-Answer Questions (a)Do all ASes have to run the same interior gateway protocols (IGPs)? Why?