Cisco CCNA Chapter 3
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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?
( D ) - A /27 (255.255.255.224) is 2 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 addresses?...Not at all
The number of host bits would never change.
You have a network that needs 29 subnets while maximizing the number of host addresses available on each subnet. How many bits must you borrow from the host feild to provide the correct subnet mask?
( D ) - a 240 mask is 4 subnets bits and provides 16 subnets each with 14 hosts. We need more subnets, so let's add subnet bits. One more subnet bit would be a 248 mask. This provides 5 subnet bits (32 subnets) with 3 host bits (6 hosts per subnet). This is the best answer.
What is the subnetwork address for a host with the IP address 18.104.22.168/28?
( 3 ) - This is a pretty simple question. A /28 is 255.255.255.240, which means that our block size is 16 in the fourth octet. 0, 16, 32, 48, 64, 80, etc.
The host is in the 64 subnet.
The network address of 172.16.0.0/19 provides how many subnets and hosts?
A. 7 subnets, 30 hosts each
B. 7 subnets, 2046 hosts each
C. 7 subnets, 8190 host each
D. 8 subnets, 20 hosts each
E. 8 subnets, 2046 hosts each
F. 8 subnets, 8190 hosts each
( F ) - A CIDR address of /19 is 255.255.240.0. This is a class B address, so the is only 3 subnet bits, but it provides 13 host bits, or 8 subnets, each with 8190 hosts.
Which two statements describes the IP address 10.16.3.65/23? (Choose two)
A. The subnet address is 10.16.3.0 255.255.254.0
B. The lowest host address in the subnet is 10.16.2.1 255.255.254.0
C. The last valid host address in the subnet is 10.16.2.254 255.255.254.0
D. The broadcast address of the subnet is 10.16.3.255 255.255.254.0
E. The network is not subnetted.
( B & D ) - The mask 255.255.254.0 (/23) used with a Class A address means that there are 15 subnet bits and 9 host bits. The block size in the third octet is 2 (256-254). So this makes the subnets in the interesting octet 0, 4, 6, etc., all the way to 254. The host 10.16.3.65 is in the 2.0 subnet. The next subnet is 4.0, so the broadcast address for the 2.0 subnet is 3.255. The valid host addresses are 2.1 through 3.254.
If a host on a network has the address 172.16.45.14/30, what is the subnet this host belongs to?
( D ) - A /30, regardless of the class of address, has a 252 in the fourth octet. This means we have a block size of 4 and our subnets are 0, 4, 8, 12, 16, etc. Address 14 is obviously in the 12 subnet.
On a VSLM network, which mask should you use on point-to-point WAN link in order to reduce the waste of IP addresses?
( D ) - A point-to-point link uses only two hosts. A /30, or 255.255.255.252 mask, provides two hosts per subnet.
What is the subnetwork number of a host with an IP address of 172.16.66.0/21?
( C ) - A /21 is 255.255.248.0, which means we have a block size of 8 in the third octet, so we just count by 8 until we reach 66. The subnet in this question 64.0. The next subnet is 72.0, so the broadcast address of the 64 subnet is 71.255.
You have an inteface on a router with the IP address of 192.168.192.10/29. Including the router interface, how many hosts can have IP addresses on the LAN attached to the router's interface?
( A ) - a /29 (255.255.255.248), regardless of the class of address, has only 3 host bits. Six hosts is the maximum number of hosts on this LAN, including the router interface.
You need to configure a server that is on the subnet 192.168.19.24/29. The router has the first available host address. Which of the following should you assign to the server?
A. 192.168.19.0 255.255.255.0
B. 192.168.19.33 255.255.255.240
C. 192.168.19.26 255.255.255.248
D. 192.168.19.31 255.255.255.248
E. 192.168.19.34 255.255.255.240
( C ) - A /29 is 255.255.255.248, which is a block size of 8 in the fourth octet. The subnets are 0, 8, 16, 24, 32, 40, etc. 192.168.19.24 is the 24 subnet, and since 32 is the next subnet, the broadcast address for the 24 subnet is 31.
192.168.19.26 is the only correct answer.
You have an inteface on a router with the IP address of 192.168.192.10/29. What is the broadcast address the host will use on this LAN?
( A ) - A /29 (255.255.255.248) jas a block size of 8 in the fourth octet. This means the subnets are 0, 8, 16, 24, etc. 10 is in the 8 subnet.
The next subnet is 16, so 15 is the broadcast address.
You need to subnet a network that has 5 subnets, each with at least 16 hosts. Which classful subnet mask would you use?
( B ) - 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.
If an Ethernet port on a router were assigned an IP address of 172.16.112.1/25, what would be the valid subnet address of this host?
( A ) - A /25 mask is 255.255.255.128. Used with a class B network, the third & fourth octets are used for subnetting with a total of 9 subnet bits, 8 bits in the third octer and 1 bit in the fourth octet. Since there is only 1 bit in the fourth octet, the bit is either on or off - which is a value of 0 or 128. The host in the question is in the 0 subnet, which has a broadcast address of the 127 since 128 is the next subnet.
Which configuration command must be in effect to allow the use of 8 subnets if the class C subnet mask is 255.255.255.224?
A. Router(config)#ip classless
B. Router(config)#ip version 6
C. Router(config)#no ip classful
D. Router(config)# ip unnumbered
E. Router(config)# ip subnet-zero
F. Router(config)# ip all-nets
( E ) - 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.
You have a network with a subnet of 172.16.17.0/22. Which is the valid host address?
A. 172.16.17.1 255.255.255.252
B. 172.16.0.1 255.255.240.0
C. 172.16.20.1 255.255.254.0
D. 172.16.16.1 255.255.255.240
E. 172.16.18.255 255.255.252.0
F. 172.16.0.1 255.255.255.0
( E ) - A class B network ID with a /22 mask is 255.255.252.0, with a block size of 4 in the third octet. The network address in the question is in the subnet 172.16.16.0 with a broadcast address of 172.16.19.255. Only option "E" even has the correct subnet mask listed, and 172.16.18.255 is a valid host.
Your router has the following IP address on Ethernet0: 172.16.2.1/23. Which of the following can be valid host IDs on the LAN interface attached to the router? (Choose two)
( D & E ) - The router's IP address on the E0 interface is 172.16.2.1/23, which is 255.255.254.0. This makes the third octet a block size of 2. The router's interface in the 2.0 subnet, and the broadcast address is 3.254. The router is using the first valid address in the range.
To test the IP stack on your local host, which IP address would you ping?
( C ) - To test the local stack on your local host, ping loopback interface of 127.0.0.1.
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