Subnetting Questions CCNA 200-120

QUESTION 91
Refer to the exhibit. What is the most appropriate summarization for these routes?

Subnetting

A. 10.0.0.0/21
B. 10.0.0.0/22
C. 10.0.0.0/23
D. 10.0.0.0/24

Correct Answer: B

Explanation
We need to summarize 4 subnets so we have to move left 2 bits (22 = 4). In this question we can guess the
initial subnet mask is /24 because 10.0.0.0, 10.0.1.0, 10.0.2.0, 10.0.3.0 belong to different networks. So “/24″
moves left 2 bits -> /22.

QUESTION 92
A national retail chain needs to design an IP addressing scheme to support a nationwide network. The
company needs a minimum of 300 sub-networks and a maximum of 50 host addresses per subnet. Working
with only one Class B address, which of the following subnet masks will support an appropriate addressing
scheme? (Choose two)
A. 255.255.255.0
B. 255.255.255.128
C. 255.255.252.0
D. 255.255.255.224
E. 255.255.255.192
F. 255.255.248.0

Correct Answer: BE

QUESTION 93
The network administrator needs to address seven LANs. RIP version 1 is the only routing protocol in use on
the network and subnet 0 is not being used. What is the maximum number of usable IP addresses that can be
supported on each LAN if the organization is using one class C address block?
A. 6
B. 8
C. 14
D. 16
E. 30
F. 32

Correct Answer: E

Explanation
“The network administrator needs to address seven LANs” means we have 7 subnets < 8 = 23, so we need to
borrow 3 bits from the host part (to create 8 subnets). We are using class C address block which has 8 bits 0
(the default subnet mask of class C is 255.255.255.0), so the number of bit 0 left is 8 – 3 = 5. Therefore the
hosts per subnet will be 25 – 2 = 30 -> E is correct.

QUESTION 94
Refer to the exhibit. What is the most efficient summarization that R1 can use to advertise its networks to R2?
A. 172.1.0.0/22

B. 172.1.0.0/21

C. 172.1.4.0/22

D. 172.1.4.0/24
172.1.5.0/24
172.1.6.0/24
172.1.7.0/24

E. 172.1.4.0/25
172.1.4.128/25
172.1.5.0/24
172.1.6.0/24
172.1.7.0/24

Correct Answer: C

Explanation
Network 172.1.4.0/25 and network 172.1.4.128/25 can be grouped to a single network 172.1.4.0/24
Network 172.1.4.0/24 + Network 172.1.5.0/24 + Network 172.1.6.0/24 + Network 172.1.7.0/24 can be grouped
to a single network 172.1.4.0/22 because we have all 4 subnetworks so we can move left 2 bits (22=4).

QUESTION 95
Gateway of last resort is not set
192.168.25.0/30 is subnetted, 4 subnets
D 192.168.25.20 [90/2681856] via 192.168.15.5, 00:00:10, Serial0/1
D 192.168.25.16 [90/1823638] via 192.168.15.5, 00:00:50, Serial0/1
D 192.168.25.24 [90/3837233] via 192.168.15.5, 00:05:23, Serial0/1
D 192.168.25.28 [90/8127323] via 192.168.15.5, 00:06:45, Serial0/1
C 192.168.15.4/30 is directly connected, Serial0/1
C 192.168.2.0/24 is directly connected, FastEthernet0/0
Which address and mask combination a summary of the routes learned by EIGRP?
A. 192.168.25.0 255.255.255.240
B. 192.168.25.16 255.255.255.252
C. 192.168.25.0 255.255.255.252
D. 192.168.25.28 255.255.255.240
E. 192.168.25.16 255.255.255.240
F. 192.168.25.28 255.255.255.240
Correct Answer: E

Explanation
We have 4 routes learned by EIGRP:
D 192.168.25.20 [90/2681856] via 192.168.15.5, 00:00:10, Serial0/1
D 192.168.25.16 [90/1823638] via 192.168.15.5, 00:00:50, Serial0/1
D 192.168.25.24 [90/3837233] via 192.168.15.5, 00:05:23, Serial0/1
D 192.168.25.28 [90/8127323] via 192.168.15.5, 00:06:45, Serial0/1

These subnets are all /30 (as it says “192.168.25.0/30 is subnetted, 4 subnets”. We have 4 successive subnets
= 22 so we can go back 2 bits -> the summarized subnet mask is 30 – 2 = 28 and the summarized network is
192.168.25.16.

QUESTION 96
The output of the show frame-relay pvc command shows ”PVC STATUS=INACTIVE”. What does this mean?
A. The PVC is configured correctly and is operating normally,but no data packets have been detected for more
than five minutes.
B. The PVC is configured correctly, is operating normally and is no longer actively seeking the address the
remote route.
C. The PVC is configured correctly, is operating normally and is waiting for interesting to trigger a call to the
remote router.
D. The PVC is configured correctly on the local switch, but there is a problem on the remote end of the PVC.
E. The PVC is not configured on the switch.

Correct Answer: D

QUESTION 97
Which command allows you to verify the encapsulation type (CISCO or IETF) for a frame relay link?
A. show frame-relay map
B. show frame-relay lmi
C. show inter serial
D. show frame-relay pvc

Correct Answer: A

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