CCNA 2 Chapter 6 V4.0 Answers
1. What two advantages does CIDR provide to a network? (Choose two.)
reduced routing table size
dynamic address assignment
automatic route redistribution
reduced routing update traffic
automatic summarization at classful boundaries
2.
Refer to the exhibit. Which address is a broadcast address for one of the subnets that are shown in the exhibit?
192.168.4.3/29
192.168.4.15/29
192.168.4.65/26
192.168.4.255/24
3.
In the network shown in the graphic, three bits were borrowed from the host portion of a Class C address. How many valid host addresses will be unused on the three point-to-point links combined if VLSM is not used?
3
4
12
36
84
180
4. Which of the following are contained in the routing updates of classless routing protocols? (Choose two.)
32-bit address
next hop router interface
subnet mask
unicast host address
Layer 2 address
5.
Refer to the exhibit. The network administrator wants to create a subnet for the point-to-point connection between the two routers. Which subnetwork mask would provide enough addresses for the point-to-point link with the least number of wasted addresses?
255.255.255.192
255.255.255.224
255.255.255.240
255.255.255.248
255.255.255.252
6. What does VLSM allow a network administrator to do?
utilize one subnet mask throughout an autonomous system
utilize multiple subnet masks in the same IP address space
utilize IGRP as the routing protocol in an entire autonomous system
utilize multiple routing protocols within an autonomous system
7. Which three interior routing protocols support VLSM? (Choose three.)
OSPF
RIP v1
RIP v2
EIGRP
BGP
STP
8. Which of the following problems does VLSM help to alleviate?
the shortage of IP addresses
the difficulty of assigning static IP addresses to hosts in large enterprises
the complexity of implementing advanced routing protocols such as OSPF and EIGRP
the shortage of network administrators qualified in the use of RIP v1 and IGRP
9.
Refer to the exhibit. A network technician enters the static route in R1 needed to reach network 10.1.1.0/24. A ping from the S0/0/0 interface on R1 to host B fails. The technician begins testing the network and has the following results:
1. pings from R1 to the S0/0/0 interface on R2….successful
2. pings from R1 to the Fa0/0 interface on R2….successful
3. pings from host B to hosts on the 10.1.1.0/24 network….successful
4. pings from host B to the Fa0/0 interface on R2….successful
5. pings from R2 to host B….successful.
What is the likely cause of the failure of the ping from R1 to host B?
The default gateway on host B is not correctly set.
There are no routes back to networks connected to R1 from R2.
There is a Layer 2 problem between R2 and host B.
Host B has a defective Ethernet card.
10. A network administrator is tasked with dividing up a class C network among the QA, Sales, and Administration departments. The QA department is made up of 10 people, the Sales is made up of 28 people, and the Administration has 6. Which two subnets masks adequately address the QA and Sales departments? (Choose two.)
255.255.255.252 for QA
• 255.255.255.224 for Sales
• 255.255.255.240 for QA
255.255.255.248 for QA
255.255.255.0 for Sales
11.
Refer to the exhibit. A network engineer is summarizing the two groups of routes on router R1 shown in the exhibit. Which summarization will work for all the subnets?
192.168.0.0/23
192.168.0.0/22
192.168.0.0/21
192.168.0.0/20
12
A Class C address has been assigned for use in the network shown in the graphic. Using VLSM, which bit mask should be used to provide for the number of host addresses required on Router A, while wasting the fewest addresses?
/31
/30
/29
/28
/27
/26
13.
Refer to the exhibit. In the network that is shown, the router interfaces are assigned the first address in each subnet. Which IP address would be usable for a host on one of the LANs in this network?
192.168.1.5/30
192.168.2.17/28
192.168.2.63/27
192.168.2.130/25
14.
Refer to the exhibit. What subnet mask will be applied if Router A sends a RIPv1 update for the network 172.16.1.0 to Router B?
none
8
16
24
15.
Refer to the exhibit. The number of required host addresses for each subnet in a network is listed in the exhibit. This number includes the host address requirements for all router ports and hosts on that subnet. After all device and router port address assignments are determined, what will be the total number of unused host addresses available?
6
14
29
34
40
62
16.
An additional subnet is required for a new Ethernet link between Router1 and Router2 as shown in the diagram. Which of the following subnet addresses can be configured in this network to provide a maximum of 14 useable addresses for this link while wasting the fewest addresses?
192.1.1.16/26
192.1.1.96/28
192.1.1.160/28
192.1.1.196/27
192.1.1.224/28
192.1.1.240/28
17. What is a supernet?
the network for a default route
a summarization of classful addresses
a network that contains both private and public addresses
a set of discontiguous networks that are controlled by an ISP
18.
Refer to the exhibit. A network administrator needs to create two subnetworks from 10.0.0.0/8 for a router running RIPv2. The Admin subnet requires 120 hosts and the Sales subnet requires 58 hosts. The network administrator assigned 10.0.1.128/25 to the Admin subnet. The Sales subnet is given 10.0.1.192/26. What will be the result of this addressing scheme?
Because RIPv2 does not support VLSM, the subnet masks will not be allowed.
The subnets will not have enough host addresses for the given network requirements.
The subnets overlap and will be rejected by the router.
The router will support the addressing scheme.
19. A router has a summary route to network 192.168.32.0/20 installed in its routing table. What range of networks are summarized by this route?
192.168.0.0 – 192.168.32.0/24
192.168.0.0 – 192.168.47.0/24
192.168.32.0 – 192.168.47.0/24
192.168.32.0 – 192.168.48.0/24
192.168.32.0 – 192.168.63.0/24
20.
Refer to the exhibit. The network administrator wants to minimize the number of entries in Router1’s routing table. What should the administrator implement on the network?
VLSM
CIDR
private IP addresses
classful routing
21.
Refer to the exhibit. What subnet mask will be applied by router B when it receives a RIPv1 update for the network 172.16.1.0?
none
8
16
24
22.
Refer to the exhibit. A network technician enters the static route in R1 needed to reach network 10.1.1.0/24. A ping from R1 to Host B fails. The technician begins testing the network and has the following results:
1. pings from R1 to the S0/0/0 interface on R2….successful
2. pings from R1 to the Fa0/0 interface on R2….successful
3. pings from Host B to hosts on the 10.1.1.0/24 network….successful
4. pings from Host B to the Fa0/0 interface on R2….successful
5. pings from R2 to Host B….successful
What is the likely cause of the failure of the ping from R1 to Host B?
Host B has a defective Ethernet card.
The default gateway on Host B is not correctly set.
There is a Layer 2 problem between R2 and Host B.
R2 does not have routes back to networks connected to R1.
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i got 100% tanx..
You have a mistake in question 9 and 22 ( which are the same question!)
The correct answer is D “R2 does not have routes back to networks connected to R1.”
the answer to q9 and 22 is correct. it says that pings from R1 to the Fa0/0 interface on R2 is successful. while R2 fa0/0 and host B are on the same subnet, if the pings to R2 fa0/0 is successful then R2 has a route back to R1.
It needs a static route back to router 1 to be right the correct answer is D R2 does not have routes back to networks connected to R1.
Re-read your book
Question 16 is incorrect
An additional subnet is required for a new Ethernet link between Router1 and Router2 as shown in the diagram. Which of the following subnet addresses can be configured in this network to provide a maximum of 14 useable addresses for this link while wasting the fewest addresses?
192.1.1.16/26
192.1.1.96/28
192.1.1.160/28
192.1.1.196/27
192.1.1.224/28 = your answer
192.1.1.240/28
The correct answer should be 192.1.1.240 or accutally 255.255.255.240 because 192.1.1.240 isnt a subnetmask
You are incorrect because it overlaps with the WAN link between Router1 and Router2. The correct answer is 192.1.1.224/28 because I went through the subnetting required for the question. I only use this site to double check my answers, not to cheat.
M.S. has answered correctly
original answer to question 16 here is correct. 192.1.1.224/28 ignore lukas
Router3 not Router2*
I don’t understand question 3. Show me, please. Thanks in advance.
Q9 The default gateway on host B is not correctly set”on the PC”
this is semester 1 lesson ,CISCO always trying to shortcut the answer
@Kaito Kuroba
In the network shown in the graphic, three bits were borrowed from the host portion of a Class C address. How many valid host addresses will be unused on the three point-to-point links combined if VLSM is not used?
3
4
12
36
84 = Answer
180
- This one kind of tripped me up myself as I knew it was a 32 host subnet and was subtracting the links initially from that. Didn’t dawn on me for a few minutes that it’s referring to a separate network for each link. Cisco questions are messed up in that way. Tripped me up when they said “combined”. What they meant was:
each link gets its own subnet from the 32 host address space:
ie. Link 1: 192.168.1.0 /27
Link 2: 192.168.1.32 /27
Link 3: 192.168.1.64 /27
Add all three of those (96 IP addresses), remove the broadcast and network IP from each network (3 networks 6 total IP’s removed) and you have 90 IP’s to work with. Each link gets 2 IP’s, so subtract another 6 and woolah. 84 IP’s remaining
Thanks for explaining, it was tripping me up to. I hate the way these are worded.
you are awesome. thank you. This questions was messed up
extends my knowledge & helps me 110%
On question 21, which asks “Refer to the exhibit. What subnet mask will be applied by router B when it receives a RIPv1 update for the network 172.16.1.0?
none
8
16
24″
The answer marked is 24 but RIPv1 is a classful routing protocol meaning that it will use the default subnet mask for the networks that it receives routes for. RIPv1 does not send subnet masks meaning that this configuration can cause routing issues.
Is there something that I am missing that makes the current answer correct or am I correct in thinking that it will use a /16?
Refer to the exhibit. A network engineer is summarizing the two groups of routes on router R1 shown in the exhibit. Which summarization will work most efficiently for all the subnets?
192.168.0.0/23
192.168.0.0/22
192.168.0.0/21 = Answer
192.168.0.0/20
hi, could you explain please?
Ok guys, my question lies with number 19. I chose the last range
32.0-63.0/24. if this is broken into binary, wouldn’t you summarize at the 19th bit (/19 instead of /20)? i mean this is where the left most bits stop matching correct? i know ive missed something here…any help understanding my error would be most appreciated.
Thanks for taking the time to answer.
19. A router has a summary route to network 192.168.32.0/20 installed in its routing table. What range of networks are summarized by this route?
192.168.0.0 – 192.168.32.0/24
192.168.0.0 – 192.168.47.0/24
192.168.32.0 – 192.168.47.0/24 = answer
192.168.32.0 – 192.168.48.0/24
192.168.32.0 – 192.168.63.0/24
Q21 should be /16 as its Rv1 which uses classfull addressing
Refer to the exhibit. Which address is a broadcast address for one of the subnets that are shown in the exhibit?
192.168.4.15/29