Computer Network Basics

The assignment content covers various topics related to computer networks, including the type of optical fibre used for LANS, RS 232 protocols, MAC addresses, Ethernet standards, data link layers, fiber optic cables, modem speeds, V.42 protocol, T1/E1 data links, synchronous transmission, and LAN technologies.

1. The European favour which type of optical fibre for LANS
1. 9/125m
2. 62.5/125m
3. 50/125m
4. 50/12.5m
2. RS 232 uses :-
1. Two wires for transmit and two wires for receive
2. One wire for transmit and one wire for receive
3. Two pair for transmit and two pairs for receive
4. None of the above
3. MAC addresses are made up of
1. 3 bytes dedicated to the manufacture + 3 bytes by the manufacturers
2. <Network><Host>
3. <country><area code><Local code>
4. 4 bytes in BCD
4. Ethernet is defined by the IEEE 802. Committee as
1. 802.4
2. 802.5
3. 802.3
4. 802.11
5. The data Link layer is subdivided into
1. Network and host sub layers
2. MAC and LLC
3. Phyical and Network Layers
4. None of the above
6. Category 5e cabling is a specific example of ________________ cabling, (e.g. fibre
optic, STP, or UTP).
Revision Questions
Lab 22
Example Multi-Choice Questions

7. In a fibre optic cable, such as 50/125 or 62.5/125, the numbers (50 and 62.5) refers
to the ________ portion of the fibre optic cable.
8. The “advertised data rate of a V.90 modem is __________ kbits/s
9. What are these: V.42, V.42bis, V.54? _______________________
10. T1/E1 data links operate at a data rate of approximately ___________.
11. Even-higher data rate alternatives to T1/E1 include _________ .
12. What is the opposite of “synchronous”? ___________________
13. If a transmission frame does NOT result in an ACK, the frame is retransmitted
after a(n) _________________.
14. What is missing CSMA/______.
15. The LAN address (MAC address) is assigned by the manufacturer of the LAN
interface (E.G the NIC card). True or False
16. Draw lines between the applicable parts of the following list and the LAN
technologies.
Source/destination addresses in frames
May have collisions
IEEE 802 and ISO 8802 standards
10,100 and 1000 Mbits/s
Configurable max frame size
Major backer was IBM
Includes a good CRC error check
Supports traffic prioritization
17. The interconnect “building blocks” at layer 2 are called bridges or
______________.
18. In LANs, a broadcast message is:
 Addressed to a single station
 Igored by all nodes on the LAN
 Read by all nodes on the LAN
 Assigned by the manufacturer
19. The response to ACK an HDLC frame with sequence number 3 and to allow
additional frames to be sent is:
 Receiver Not Ready (RNR) 4
 Receiver Ready (RR) 4
 Receiver Ready (RR) 3
 Receiver Not Ready (RNR) 3
Token Ring Ethernet