1.The Ethernet Standards are also known as the _______ standards. a. IEEE b. 802
ID: 3557198 • Letter: 1
Question
1.The Ethernet Standards are also known as the _______ standards.
a. IEEE
b. 802.3*
c. 802
d. ATM
e. LAN
2.CSMA/CD provides a way to:
a. control networks so that only one station transmits at any one moment.*
b. allow multiple stations to transmit concurrently.
c. allow secure network transmissions to occur between two registered stations.
d. allow secure network transmissions to occur between any two stations.
3.CSMA recognizes the fact that:
a. multiple stations may wish to share a single MAC address.
b. there can never be more than two stations attempting to transmit packets at any given moment.
c. different types of media can support different communications speeds.
d. multiple stations may attempt to transmit concurrently.*
e. any collision that occurs can crash the network.
4.CSMA/CD controls transmissions by ____ in order to avoid collisions.
a. hubs
b. hubs and NICs*
c. switches
d. hubs, NICs, and switches
e. NICs
5._____ switches normally connect a station to the network.
a. Core
b. Workgroup
c. Both of the above.
d. Neither a. nor b.
6.Which statement most accurately compares wireless LANs to conventional wired LANs?
a. Wireless LANs typically have more propagation problems.*
b. Wireless LANs typically have slower speeds, but fewer congestion problems.
c. Wireless LANs require licenses to use radio frequencies, conventional LANs are unlicensed.
d. All of the above are true.
7.Which of the following statements best describes how wireless collisions are handled?
a. Stations use CSMA/CD to detect collisions and to retransmit when they occur.
b. Stations use CSMA/CD to detect collisions and then retransmit to an adjacent access point when collisions are detected.
c. Stations use CSMA/CA+ACK to avoid errors and retransmit frames that do not get through.*
d. When an error is detected, both the sending and receiving workstations retransmit on another frequency.
8.How many channels does 802.11b support?
a. 1
b. 3*
c. 7
d. 9
e. 11
9.Taking your cellular telephone from one cell to another in the same city is _____.
a. roaming
b. handoff
c. Either of the above.
10.How many MTSOs MUST be used to connect a local cellular customer to someone
Explanation / Answer
1. b. 802.3
2. a. control networks so that only one station transmits at any one moment.
3. d. multiple stations may attempt to transmit concurrently.
4. b. hubs and NICs
5. c. both
6. a. Wireless LANs typically have more propagation problems.
7. c. Stations use CSMA/CA+ACK to avoid errors and retransmit frames that do not get through.
8. b. 3
9. b. handoff
10. a. 0, as long as the caller is not roaming.
11. c. increase transmission speeds
12. b. Lack of compatible transmission standards
13. 2.5G
14. c. PTTs
15. a. CLECs
16. e. Both c. and d
17. e. Transport
18. a.The host portion must appear first.
19. a. Once for each and every packet that it receives.
20. b. returns the packet to the sending router with an error advisement.
21. c. e-mail.
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