Intoduction to Routing Flashcards
1
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?
a/14 b/15
c/ 16
d/30 e/ 31 f/ 62
1
d/ A /27 (255.255.255.224) is 3 bits on and 5 bits off. This provides 8 subnets, each with 30 hosts.
2
You have a Class A host of 10.0.0.110/25. It needs to communicate to a host with an IP address of 10.0.0.210/25. Which of the following devices do you need to use in order for these hosts to communicate?
a/ Layer 2 switch
b/ Router
c/ DNS server
d/ Hub
2
b/ Router What is your subnet mask? 255.255.255.128. Regardless of the class of address, this is a block size of 128 in the fourth octet. You need a router for these two hosts to communicate because they are in different subnets.
3
What is the subnet work address for a host with the IP address 200.10.5.68/28?
a/ 200.10.5.56 b/ 00.10.5.32 c/ 200.10.5.64 d/ 200.10.5.0
3
c/ 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, and so on). The host is in the 64 subnet.
4
The network address of 172.16.0.0/19 provides how many subnets and hosts?
a/7 subnets, 30 hosts each
b/7 subnets, 2,046 hosts each
c/ 7 subnets, 8,190 hosts each d/ 8 subnets, 30 hosts each e/ 8 subnets, 2,046 hosts each
f/ 8 subnets, 8,190 hosts each
4
f/ A CIDR address of /19 is 255.255.224.0. This is a Class B address, so that is only 3 subnet bits, but it provides 13 host bits, or 8 subnets, each with 8,190 hosts.
5
You cannot get on the Internet. You have them verify their IP address, mask, and default gateway. The IP address is 10.0.37.144, with a subnet mask of 255.255.254.0. The default gateway is 10.0.38.1.
a/ Incorrect DNS server address
b/ Invalid subnet mask
c/ Incorrect gateway IP
d/ IP address and mask not compatible
5
C. The host ID of 10.0.37.144 with a 255.255.254.0 mask is in the 10.0.36.0 subnet
6
If a host on a network has the address 172.16.45.14/30, what is the subnet work this host belongs to?
a/ 172.16.45.0
b/ 172.16.45.4
c/ 172.16.45.8
d/ 172.16.45.12
f/ 172.16.45.16
6
Answer:
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, and so on. Address 14 is obviously in the 12 subnet.
7
On a network, which mask should you use on point-to-point WAN links in order to reduce the waste of IP addresses?
a/ /27
b/ /28
c/ /29
d/ /30
e/ /31
7
d/ A point-to-point link uses only two hosts. A /30, or 255.255.255.252, mask provides two hosts per subnet.
8
On which of the following devices are you most likely to be able to implement NAT?
a/ Hub b/ Ethernet switch c/ Router d/ Bridge
8
Answer:
c/ Devices with Layer 3 awareness, such as routers and firewalls, are the only ones that can manipulate the IP header in support of NAT.
9
You have an interface 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 interface?
a/ 6 b/ 8 c/ 30 d/ /62 e/ 126
9
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.
10
When configuring the IP settings on a computer on one subnet to ensure that it can communicate with a computer on another subnet, which of the following is desirable?
a/ Configure the computer with the same default gateway as the other computer.
b/ Configure the computer with the same subnet mask as the other computer.
c/ Configure the computer with a default gateway that matches the IP address of the interface of the router that is attached to the same subnet as the computer.
d/ Configure the computer with a subnet mask that matches the IP address of the interface of the router that is attached to the same subnet as the computer.
10
a/ A computer should be configured with an IP address that is unique throughout the reachable internet work.
11
You have an interface on a router with the IP address of 192.168.192.10/29. What is the broadcast address the hosts will use on this LAN?
a/ 192.168.192.15
b/ 192.168.192.31
c/ 192.168.192.63
d/ 192.168.192.127 e/ 192.168.192.255
11
a/ A /29 (255.255.255.248) has a block size of 8 in the fourth octet. This means the subnets are 0, 8, 16, 24, and so on. 10 is in the 8 subnet. The next subnet is 16, so 15 is the broadcast address.
12
What is the highest usable address on the 172.16.1.0/24 network?
a/ 172.16.1.255 b/ 172.16.1.254 c/ 172.16.1.253 d/ 172.16.1.23
12
b/ A 24-bit mask, or prefix length, indicates that the entire fourth octet is used for host identification.
13
Connecting two hosts directly through their interfaces What can be done to provide connectivity between the hosts?
a/ A crossover cable should be used in place of the straight-through cable.
b/ A rollover cable should be used in place of the straight-through cable.
c/ The subnet masks should be set to 255.255.255.192.
d/ A default gateway needs to be set on each host.
e/ The subnet masks should be set to 255.255.255.0.
13
a/e. You need a crossover cable.
and set both masks to 255.255.255.0 (/24).
14
If an Ethernet port on a router was assigned an IP address of 172.16.112.1/25, what would be the subnet address of this host?
a/ 172.16.112.0 b/ 172.16.0.0 c/ 172.16.96.0 d/ 172.16.255.0 e/ 172.16.128.0
14
a/ 172.16.112.0
/25 mask is 255.255.255.128.
15
You have a network with a subnet of 172.16.17.0/22. Which of the following is a 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
15
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 subnet 172.16.16.0 with a broadcast address of 172.16.19.255. Only option E has the correct subnet mask listed, and 172.16.18.255 is a valid host.
