Practice Question and Answer
8Q: Which mask should you use on point-to-point WAN links in order to reduce the waste of IP addresses? 1662 05b5cc7e7e4d2b41977751a1a
5b5cc7e7e4d2b41977751a1a- 1/28false
- 2/29false
- 3/30true
- 4/31false
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Answer : 3. "/30"
Explanation :
Answer: C) /30 Explanation: A point-to-point link uses only two hosts. A/30, or 255.255.255.252, mask provides two hosts per subnet.
Q: What is the subnetwork address for a host with the IP address 200.10.5.68/28? 4621 05b5cc7e7e4d2b41977751a15
5b5cc7e7e4d2b41977751a15- 1200.10.5.56false
- 2200.10.5.32false
- 3200.10.5.64true
- 4200.10.5.0false
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Answer : 3. "200.10.5.64"
Explanation :
Answer: C) 200.10.5.64 Explanation: This is a pretty simple question. A/28 is 255.255.255.240, which means that our block size is 16 in the fourth octent. 0,16, 32, 48, 64, 80, etc. The host is in the 64 subnet.
Q: You need to subnet a network that has 5 subnets, each wit at least 16 hosts. Which classful subnet mask would you use? 1546 05b5cc7e7e4d2b41977751a10
5b5cc7e7e4d2b41977751a10- 1255.255.255.192false
- 2255.255.255.224true
- 3255.255.255.240false
- 4255.255.255.248false
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Answer : 2. "255.255.255.224"
Explanation :
Answer: B) 255.255.255.224 Explanation: You need 5 subnets, each with at least 16 hosts. The mask 255.255.255.240 provides 16 subnets with 14 hosts - this will not work. The mask 255.255.255.224 provides 8 subnets, each with 30 hosts. This is the best answer.
Q: What is the maximum number of IP addresses that can be assigned to hosts on a local subnet that uses the 255.255.255.224 subnet mask? 1142 05b5cc7e7e4d2b41977751a0b
5b5cc7e7e4d2b41977751a0b- 115false
- 216false
- 330true
- 431false
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Answer : 3. "30"
Explanation :
Answer: C) 30 Explanation: A/27 (255.255.255.224) is 3 bits on and 5 bits off. This provides 8 subnets, each with 30 hosts. Does it matter if this mask is used with a Class A, B, or C network address? Not at all. The number of host bits would never change.
Q: Which configuration command must be in effect to allow the use of 8 subnets if the Class C subnet mask is 255.255.25.224? 1571 05b5cc7e7e4d2b41977751a06
5b5cc7e7e4d2b41977751a06- 1Router(config)#ip classlessfalse
- 2Router(config)#ip version 6false
- 3Router(config)#ip unnumberedfalse
- 4Router(config)#ip subnet-zerotrue
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Answer : 4. "Router(config)#ip subnet-zero"
Explanation :
Answer: D) Router(config)#ip subnet-zero Explanation: A Class C subnet mask of 255.255.255.224 is 3 bits on and 5 bits off (11100000) and provides 8 subnets, each with 30 hosts. However, if the command ip subnet-zero is not used, then only 6 subnets would be available for use.
Q: To test the IP stack on your local host, which IP address would you ping? 2699 05b5cc7e7e4d2b41977751a01
5b5cc7e7e4d2b41977751a01- 1127.0.0.0false
- 21.0.0.127false
- 3127.0.0.1true
- 4127.0.0.255false
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Answer : 3. "127.0.0.1"
Explanation :
Answer: C) 127.0.0.1 Explanation: To test the localstack on your host, ping the loop back interface of 127.0.0.1
Q: You have a Class B network and need 29 subnets. What is your mask? 1182 05b5cc7e7e4d2b41977751a00
5b5cc7e7e4d2b41977751a00- Show AnswerHide Answer
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Answer :
Explanation :
A default Class B is 255.255.0.0. A Class B 255.255.255.0 mask is 256 subnets, each with 254 hosts. We need fewer subnets. If we used 255.255.240. 0, this provides 16 subnets. Let's add one more subnet bit. 255.255.248.0. This is 5 bits of subnetting, which provides 32 subnets. This is our best answer A/21
Q: What is the subnet for host ID 10.16.3.65/23? 1873 05b5cc7e7e4d2b419777519ff
5b5cc7e7e4d2b419777519ff- Show AnswerHide Answer
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Answer :
Explanation :
A/23 is 255.255.254.0. The third octet is a block size of 2.0, 2, 4. The subnet is in the 16.2.0 subnet; the broadcast address is 16.3.255