13. CCNA 서브넷팅 문제

1. You are working in a data center environment and are assigned the address range 10.188.31.0/23.You are asked to develop an IP addressing plan to allow the maximum number of subnets with as many as 30 hosts each.Which IP address range meets these requirements?

A. 10.188.31.0/27
B. 10.188.31.0/26
C. 10.188.31.0/29
D. 10.188.31.0/28
E. 10.188.31.0/25

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10.188.31.0/23
255.255.1111 1110.0000 0000
10.188. 0001 1111.0000 0000
10.188. 0001 1110.0000 0000
10.188.30.0 네트워크 주소
10.188.31.255 브로캐스트 주소
33보다 큰 2의 승은 64(2^6)
255.255.1111 1110.0000 0000
255.255.1111 1111.1100 0000
255.255.255.192
3비트로 서브넷팅하면 서브넷이 8개
10.188.30.0/26
10.188.30.64/26
10.188.30.

2. Given an IP address 172.16.28.252 with a subnet mask of 255.255.240.0, what is the correct network address?

A. 172.16.16.0
B. 172.16.24.0
C. 172.16.0.0
D. 172.16.28.0

3. The network technician is planning to use the 255.255.255.224 subent mask on the network.which three valid IP addresses can the technician use for the hosts?(choose three)
A. 172.22.243.127
B. 172.22.243.191
C. 172.22.243.190
D. 10.16.33.98
E. 10.17.64.34
F. 192.168.1.160

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4. The network administrator is asked to configure 113 point-to-point links.Which IP addressing scheme best defines the address range and subnet mask that meet the requirement and waste the fewest subnet and host addresses?

A. 10.10.0.0/18 subnetted with mask 255.255.255.252
B. 10.10.0.0/25 subnetted with mask 255.255.255.252
C. 10.10.0.0/24 subnetted with mask 255.255.255.252
D. 10.10.0.0/23 subnetted with mask 255.255.255.252
E. 10.10.0.0/16 subnetted with mask 255.255.255.252

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현재 서브넷마스크
255.255.1111 1111.1111 1100
현재 서브넷마스크는 7비트로 서브네팅 된 마스크이다
7비트 만큼 수퍼네팅(=합침)
255.255.1111 1110.0000 0000 /23
255.255.254.0

5. If an Ethernet port on a router was assigned an IP address of 172.1.1.1/20,what is the maximum number of hosts allowed on this subnet?

A. 4094
B. 1024
C. 8190
D. 2046
E. 4096

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172.1.1.1/20
172.1.1111 0000.0000 0000
호스트 수는 2^12 = 4096 - 2 (대표주소+브로드캐스트) =4094