CS 742 Computer Communication Networks Exam 2 - Name:
Fall 2002
Part 1: (30 p oints - 3 points for each problem)
( C ) 1. IP is a (A) hardware (B) network architecture (C) protocol (D) software
( C ) 2. The package size of an ATM cell is:
(A) 32 bytes (B) 48 bytes (C) 53 bytes (D) 64 bytes
( A ) 3. Which command sends ICMP echo request packets to network hosts?
(A) ping (B) netstat (C) ifconfig (D) arp
( B ) 4. What is the header size of a IPv6 packet?
(A) 20 bytes (B) 40 bytes (C) 48 bytes (D) 60 bytes
( D ) 5. Which address is shown when we issue the command: ping localhost?
(A) the IP address of the machine (B) 0.0.0.0 (C) 127.0.0.0 (D) 127.0.0.1
( A ) 6. Which is a multicast address?
(A) 224.5.6.7 (B) 196.168.2.1 (C) 0.0.0.0 (D) 127.0.0.1
( D ) 7. Which byte order is used in the Internet protocols?
(A) forward-endian (B) reverse-endian (C) little-endian (D) big-endian
( C ) 8. Which I/O models is used in the select function?
(A) blocking I/O (B) nonblocking I/O (C) I/O multiplexing (D) signal driven I/O
( B ) 9. Which function is not used in UDP socket programming in C?
(A) bind (B) listen (C) socket (D) recvfrom
( A ) 10. In which function do we specify PF UNIX or PF INET?
(A) socket (B) bind (C) connect (D) listen
Part 2: (70 p oints + 10 bonus points)
1. Briefly explain these terminologies. If they are acronyms, also write what they stand for. (12 points)
(a) RIP - Routing Information Protocol is a widely-used protocol for managing router information
within a self-contained network such as a corporate local area network or an interconnected group
of such LANs.
(b) DHCP - Dynamic Host Configuration Protocol is a communications protocol that lets network
administrators manage centrally and automate the assignment of Internet Protocol (IP) addresses
in an organization’s network.
(c) CIDR - Classless Inter-Domain Routing or supernetting is a way to allocate and specify the
Internet addresses used in inter-domain routing more flexibly than with the original system of
Internet Protocol IP address classes.
(d) BGP - Border Gateway Protocol is a protocol for exchanging routing information between gate-
way hosts (each with its own router) in a network of autonomous systems.
2. A 1500-byte datagram (20-byte IP header plus 1480 bytes of data) arrives for transmission across a
network that has the maximum transmission unit (MTU) of 600 bytes. How long will each of the three
segments be (including the IP header)? (4 points)
Ans: The largest amount of data that can be transmitted is 600 - 20 = 580 bytes. The last seg-
ment will be 1480 - 580 -580 = 320 bytes. The three segements will be 600 bytes, 600 bytes, and 340
bytes.
