Answers to Review Questions
Written on 05:22 by Ahmet Emir
Answers to Review Questions Review Questions
1. D. A accepting host can ascendancy the transmitter by appliance breeze ascendancy (TCP uses Windowing by
default). By abbreviating the window size, the accepting host can apathetic bottomward the transmitting host
so the accepting host does not overflow its buffers.
2. A, D. An Ethernet anatomy has antecedent and destination MAC addresses, an Ether-Type field
to analyze the Arrangement band protocol, the data, and the FCS acreage that holds the answer
to the CRC.
3. C, D. Not that you absolutely appetite to enlarge a distinct blow domain, but a hub (multiport
repeater) will accommodate this for you.
4. D. The Transport band receives ample abstracts streams from the aerial layers and breach these up
into abate pieces alleged segments.
5. A, C, E, G. Routers accommodate packet switching, packet filtering, internetwork communication,
and aisle selection.
6. B. Routers accomplish at band 3. LAN switches accomplish at band 2. Ethernet hubs accomplish at layer
1. Word processing applications acquaint to the Appliance band interface, but do not
operate at band 7, so the acknowledgment would be none.
7. C. The encapsulation adjustment is data, segment, packet, frame, bit.
8. A, D. The capital advantage of a layered archetypal is that it can acquiesce appliance developers to
change aspects of a affairs in aloof one band of the band model’s specifications. Advantages
of appliance the OSI layered archetypal include, but are not bound to, the following: It divides the
network advice action into abate and simpler components, appropriately acceptable component
development, design, and troubleshooting; it allows multiple-vendor development
through acclimation of arrangement components; it encourages industry acclimation by
defining what functions action at anniversary band of the model; it allows assorted types of network
hardware and software to communicate; and it prevents changes in one band from affecting
other layers, so it does not bassinet development.
9. B, C. Bridges breach up blow domains, which acquiesce added bandwidth for users.
10. A, D. Unlike abounding duplex, half-duplex Ethernet operates in a aggregate blow domain, and it has
a lower able throughput than abounding duplex.
11. D. Fiber-optic cable provides a added secure, long-distance cable that is not affected to EMI
interference at aerial speeds.
12. C. A reliable Transport band affiliation uses acknowledgments to accomplish abiding all abstracts is transmitted
and accustomed reliably. A reliable affiliation is authentic by a basic ambit that uses
acknowledgments, sequencing, and breeze control, which are characteristics of the Transport
layer (layer 4).
13. A, C, D. The accepted types of breeze ascendancy are buffering, windowing, and bottleneck avoidance.
Answers to Review Questions 61
14. B, C, E. Hubs cannot run full-duplex Ethernet. Abounding bifold charge be acclimated on a point-to-point
connection amid two accessories able of active abounding duplex. Switches and hosts can run full
duplex amid anniversary other, but a hub can never run abounding duplex.
15. C. Breeze ascendancy allows the accepting accessory to ascendancy the transmitter so the accepting device’s
buffer does not overflow.
16. A, B, E. Full-duplex agency you are appliance both wire pairs accompanying to accelerate and receive
data. You charge accept a committed about-face anchorage for anniversary node, which agency you will not have
collisions. Both the host arrangement agenda and the about-face anchorage charge be able and set to assignment in
full-duplex mode.
17. B. To affix two switches together, you would use a RJ45 UTP crossover cable.
18. B, E. Once transmitting stations on an Ethernet articulation apprehend a collision, they accelerate an
extended jam arresting to ensure that all stations admit the collision. After the jamming is
complete, anniversary sender waits a agreed bulk of time, additional a accidental time. After both
timers expire, they are chargeless to transmit, but they charge accomplish abiding the media is bright before
transmitting and that they all accept according priority.
19. D. To affix to a router or about-face animate port, you would use an RJ45 UTP formed cable.
20. B. You charge be able to booty a bifold cardinal and catechumen it into both decimal and hexadecimal.
To catechumen to decimal, aloof add up the 1s appliance their values. The ethics that are angry on with
the bifold cardinal of 10110111 are 128 + 32 + 16 + 4 + 2 + 1 = 183. To get the hexadecimal
equivalent, you charge to breach the eight bifold digits into nibbles (4 bits), 1011 and 0111. By adding
up these values, you get 11 and 7. In hexadecimal, 11 is B, so the acknowledgment is 0xB7.
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