Question 1. Multiple Choice Set – For each of the following questions, select the most appropriate
answer:
1. Which network topology requires a central controller or a hub?
a. Bus
b. Mesh
c. Star
d. Ring
2. Which topology (or topologies) typically use(s) the token passing mechanism?
a. Mesh
b. Bus
c. Ring
d. Bus and Ring
3. Registered port addresses run from
a. 0 to 1023
b. 1024 to 49151
c. 49152 to 65535
d. 1024 to 65535
4. The following address is a random number between 49,152 and 65,535 for each application
a. Client port address
b. Server port address
c. Client IP address
d. Server IP address
5. IEEE 802.11 belongs to which TCP/IP layer?
a. Application
b. Transport
c. Network
d. Data Link
6. The following interconnection device is mainly used for boosting signal levels and distance
extension.
a. Repeater
b. Bridge
c. Router
d. Gateway
7. If you want to send a message from a TCP/IP host to a DECNet host, you would use the
following device
a. Firewall
b. Router with a NAT (network address translator)
c. Switch
d. Gateway
8. Traceroute works by sending
a. ICMP echo request packets with gradually increasing TTL values starting with 1.
b. ICMP echo reply packets with gradually increasing TTL values starting with 1.
c. ICMP echo request packets with gradually decreasing TTL values starting at default 64.
d. ICMP echo reply packets with gradually decreasing TTL values starting at default 64.
9. The following is an example of a soft-coded address
a. IP address
b. MAC address
c. Neither (a) nor (b)
d. Both (a) and (b)
10. If B is the bandwidth of a link, L is the average packet size and a is the number of packets arrival
rate, the formula for traffic intensity is given by
a. (B*a)/L
b. (L*B)/a
c. (a*L)/B
d. a/(L*B)
11. If the following layer in TCP/IP is not present, data cannot be digitized
a. Network
b. Data Link
c. Transport
d. Physical
12. If the following layer in TCP/IP is not present, data cannot be routed
a. Network
b. Data Link
c. Transport
d. Physical
13. Which TCP/IP layer defines the LAN and WAN protocols?
a. Network
b. Data Link
c. Transport
d. Physical
14. A client X makes an HTTP connection with a server Y. In the reply message from Y to X, which of the
following is true?
a. Source port address is the random number picked by Y, and destination port address is 80.
b. Source port address is 80, and destination port address is the random number picked by Y.
c. Source port address is the random number picked by X, and destination port address is 80.
d. Source port address is 80, and destination port address is the random number picked by X.
15. Which link type is able to transmit longer distances by noise cancellation?
a. Unshielded twisted pair
b. Coaxial cable
c. Optical fiber
d. Wireless
16. If you need to plug in a coaxial cable, you will need one of these:
a. RJ45 connector
b. RJ11 connector
c. BNC connector
d. LC connector
17. If you are using a codec, you are most likely doing the following:
a. Digital data generation, digital transmission
b. Digital data generation, analog transmission
c. Analog data generation, digital transmission
d. Analog data generation, analog transmission
18. The core and cladding of an optical fiber are made of _______________ material.
a. Copper
b. Bimetallic
c. Hollow
d. Silicon
19. An Ethernet cable is labeled 10BASE2. It means that it has the following characteristics:
a. 10Mbps, digital, 2km
b. 10X10 Mbps, analog, 200 m
c. 10 X 10 Kbps, digital, 2 km
d. 10 Mbps, digital, 200 m
20. An Ethernet cable is labeled 100BROAD36. It means that it has the following characteristics:
a. 100 Kbps, digital, 3.6km
b. 100 Mbps, analog, 36 m
c. 100 Mbps, digital, 3600m
d. 100 Mbps, analog, 3.6km
21. Ethernet has the following transmission characteristic
a. Analog data, digital transmission
b. Analog data, analog transmission
c. Digital data, analog transmission
d. Digital data, digital transmission
22. Which of the following is a characteristic of connectionless service?
a. Sender sends when receiver is ready
b. Retransmission not normally done
c. Sender just sends data
d. (b) and (c) above
e. (a) and (b) above
23. The following parameter is used in an IP datagram to prevent packets from infinitely looping in the
Internet:
a. Protocol ID
b. Type of service
c. Time to Live
d. Routing timeout
24. The following sets of parameters are used for the purpose of fragmentation of an IP datagram:
a. Protocol ID, identification and Header length
b. Identification, offset and flags
c. Identification, protocol ID and flags
d. Header length, offset and flags
Question 4 (Short answer question). Which of the connection strategies (Circuit Switching, Message
Switching, Datagram packet switching, Virtual Circuit Packet Switching) is characteristic of each of the
following statements:
• Packets are guaranteed to be received in the correct order
• Packets can be rerouted in the case of congestion or faults
• Buffer overflows at intermediate nodes can be a problem
• All data follow the same path, but path is not dedicated
• Traditional telephony uses this type of switching
• Internet uses this type of switching
Question 5 (Problem Solution Type Question):
• Let Tproc be the processing time in a node and Tque be the buffer time in the node for a packet of
L bytes. Let the bandwidth of the link connecting the node be B Mbps, d is the length of the link in
meters and s is the signal speed on the link in meters/sec. Determine the nodal delay.
• The length of the ring in a 16 Mbps token ring network is 1000 meters. The speed of propagation
in the cable is 60 percent the speed of light (which is 300,000,000 meters/second). Each station
holds the token for 5 microseconds (processing plus buffering). How long does it take for a 3-byte
token to go around the ring? Assume that the number of stations in the ring is 25.
Question 6 (Problem-Solution Type question): The network shown below runs a virtual circuit
switching protocol. R1, R2, R3 and R4 are switches connecting hosts S1, S2, S3, D1, D2, and D3. The
port numbers on each switch are p1, p2, p3, etc.
The following virtual circuit connections are to be established:
Source Destination Path
S1 D1 S1 to R1 to R3 to R4 to D1
S2 D2 S2 to R3 to R1 to R2 to D
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