Cisco Systems 2 manual 135

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A.Switches create a single collision domain and a single broadcast domain. Routers provide separate broadcast domains.

B.Switches create separate collision domains but a single broadcast domain. Routers provide a separate broadcast domains.

C.Switches create a single collision domain and a separate broadcast domain. Router provides a separate broadcast domain as well.

D.Switches create separate collision domains and separate broadcast domains. Routers provide separate collision domains.

Answer: B

Explanation:

Switches break up the collision domains, but it is still a single broadcast domain. Routers also create separate collision domains, but also separate broadcast domains, as routers usually do not pass broadcast traffic.

Incorrect Answers:

A is incorrect; switches create multiple collision domains.

C is incorrect; switches maintain one broadcast domain, and separate/multiple collision domains. D is incorrect; switches maintain one broadcast domain.

Steve McQuerry. Interconnecting Cisco Network Devices. (Cisco Press: 2000) pages 30-31.

Q. 219

Given the following IP address from the class C address range 192.168.21.12 your network plan needs addresses for twenty-eight small offices. Each office uses its own subnet. The network designs specify that you configure for 5 bits of subnetting when you configure for this in the Cisco IOS software. Which subnet mask should you use?

A.255.255.0.28

B.255.255.255.0

C.255.255.255.28

D.255.255.255.248

E.255.255.255.252

Answer: D

Explanation: We need to expand the class C subnet mask, and based on the calculation above, the last octet is divided into 5 bits network, 3 bits host, which is 248.

If I have 5 bits of subnetting for the network subnet, that leaves 3 bits for hosts.

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