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[علي2060]

Cisco 640-801
Cisco® Certified Network Associate (CCNA®)
Q&A with explanations
Version 86.0
السؤال الأول:
QUESTION NO: 1
Which of the following devices can an administrator use to segment their LAN?
(Choose all that apply)
A. Hubs
B. Repeaters
C. Switches
D. Bridges
E. Routers
F. Media Converters
G. All of the above
Answer: C, D, E
Explanation:
Routers, switches, and bridges don't transmit broadcasts. They segment a large
cumbersome network, into multiple efficient networks.
Incorrect Answers:
A. Hubs is incorrect because a hub doesn't segment a network, it only allows more hosts
on one. Hubs operate at layer one, and is used primarily to physically add more stations to
the LAN.
B. This also incorrect because the job of a repeater is to repeat a signal so it can exceed
distance limitations. It also operates at layer one and provides no means for logical LAN
segmentation.
F. This is incorrect because media converters work by converting data from a different
media type to work with the media of a LAN. It also operates at layer one and provides no
means for logical LAN segmentation.

ما رأيكم : أليست الإجابة الصحيحة هي E فقط. فالموجهات وحدها هي التي تقسم ال BroadCast Domain فهي وحدها فقط التي لا تقوم بنقل ال Broadcast إلى باقي أجزاء الشبكة.

انظر Sybex SG CCNA Edit 5 الفصل الأول:
"Routers, by default, break up a broadcast domain,which is the set of all devices on a network segment that hear all broadcasts sent on that segment."

و في نهاية الفصل:
"Understand the difference between a hub, a bridge, a switch, and a router. Hubs create one collision domain and one broadcast domain. Bridges break up collision domains but create one large broadcast domain. They use hardware addresses to filter the network. Switches are really just multiple port bridges with more intelligence. They break up collision domains but create one large broadcast domain by default. Switches use hardware addresses to filter the network.Routers break up broadcast domains (and collision domains) and use logical addressing to filter the network."