hw1 - the wireless card, and also plug into a local...

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CS 217A: Homework 1 Due on Jan 12, 2011 Lixia Zhang
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CS 217A (Lixia Zhang ): Homework 1 Problem 1 Note: all questions in this homework should be taken in the context of RFC 791. Please use this as the authoritative source for your answers. Problem 1 What are the 4 mechanisms IP uses to provide its service? Problem 2 Describe what provisions (if any) IP has for flow control Problem 3 What does IP’s “internet module” map: a) Names to addresses b) Local addresses to routes c) Internet addresses to local network addresses Problem 4 What specifically differentiates class a, b, and c addresses? Problem 5 How does a receiver know if a fragment is the last fragment of a datagram? Problem 6 What does it mean if an IP address has the first 3 bits set to 1? Problem 7 Assume you have a laptop that has both a wireless card, and a wired Ethernet connection. If you enable
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Unformatted text preview: the wireless card, and also plug into a local Ethernet network, and receive a dierent IP address on each interface, is your laptop required to behave as 2 dierent hosts? Problem 8 Is it possible for a datagram to be fragmented so many times that the fragmentation oset becomes too large to t into the 13-bit header eld? If so, how does IP handle this, and if not why not? Problem 9 Why is 68 octets the minimum datagram size that every IP module MUST be able to forward? Page 1 of 2 CS 217A (Lixia Zhang ): Homework 1 Problem 10 Problem 10 What units is TTL measured in: a) Seconds b) Minutes c) Hop-count If a or b, can a host manage the TTL if it doesnt have a clock (and how)? Page 2 of 2...
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hw1 - the wireless card, and also plug into a local...

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