CCNA Module 10

1How does a router decide where the contents of a received frame should be forwarded?

* by matching destination IP addresses with networks in the routing table
by matching the destination IP address with IP addresses listed in the ARP table
by matching the destination MAC address with MAC addresses listed in the CAM table
by forwarding the frame to all interfaces except the interface on which the frame was received




2 Refer to the exhibit. Host A pings host B. When R4 accepts the ping into the Ethernet interface, what two pieces of header information are included? (Choose two.)

source IP address: 192.168.10.129
source IP address: BBBB.3333.5677
source MAC address: 5555.AAAA.6666
destination IP address: 192.168.10.33
*destination IP address: 192.168.10.134
*destination MAC address: 9999.DADC.1234




3 Refer to the exhibit. Host A is connected to the LAN, but it cannot get access to any resources on the Internet. The configuration of the host is shown in the exhibit. What could be the cause of the problem?

The host subnet mask is incorrect.
The default gateway is a network address.
The default gateway is a broadcast address.
*The default gateway is on a different subnet from the host.


4 Refer to the exhibit. A student in the Cisco network class has designed a small office network to enable hosts to access the Internet. What recommendation should the teacher provide to the student in regards to the network design?

Replace the Layer 2 switch with a hub.
*Replace the Layer 2 switch with a router.
Replace the Layer 2 switch with a bridge.
Replace the Layer 2 switch with a transceiver.







5 Refer to the exhibit. A newly hired technician is testing the connectivity of all hosts by issuing a ping command. The technician notices that a default gateway is not configured on all the hosts, but all hosts have connectivity between hosts, a fact which seems to confuse the technician. How would you explain the connectivity to the technician?

The hosts are detecting the default gateway configured on the hub.
*The hosts are all in one LAN, so default gateway information is not needed.
The hosts in the network only require that one host has a gateway configured.
The hosts in the network would only need a gateway if a switch replaces the hub.
The hosts are using broadcast to reach each other since no gateway is configured.


6 A company is using a Class B IP addressing scheme and expects to need as many as 100 networks. What is the correct subnet mask to use with the network configuration?

255.255.0.0
255.255.240.0
*255.255.254.0
255.255.255.0
255.255.255.128
255.255.255.192

7 What do switches and routers use to make forwarding decisions?

Switches and routers both use IP addresses.
Switches and routers use both MAC and IP addresses.
Switches use IP addresses. Routers use MAC addresses.
*Switches use MAC addresses. Routers use IP addresses.
Switches use MAC and IP addresses. Routers use IP addresses.


8 Which device would add security to a network by not forwarding broadcasts?

hub
*router
switch
bridge
repeater


9 Company XYZ uses a network address of 192.168.4.0. It uses the mask of 255.255.255.224 to create subnets. What is the maximum number of usable hosts in each subnet?

6
14
*30
62


10 Host A is connected to the LAN, but it cannot connect to the Internet. The host configuration is shown in the exhibit. What are the two problems with this configuration? (Choose two.)

*The host subnet mask is incorrect.
The host is not configured for subnetting.
The default gateway is a network address.
*The default gateway is on a different network than the host.
The host IP address is on a different network from the Serial interface of the router


11 Refer to the exhibit. A network administrator is planning the addressing scheme for the LAN using 172.25.14.0/26. The hosts are to be assigned addresses 172.25.14.1 – 172.25.14.25. The LAN interface of the router is to be configured using 172.25.14.63 as the IP address. What would describe this addressing scheme?

The LAN is being addressed properly.
The subnet that is being assigned is not a usable subnet address.
*The router LAN interface is being assigned a broadcast address.
The subnet mask does not allow enough host addresses in a single subnet.



12 What is the purpose of a subnet mask in a network?

A subnet mask is not necessary when a default gateway is specified.
A subnet mask is required only when bits are borrowed on a network.
*A subnet mask is used to determine in which subnet an IP address belongs.
A subnet mask is used to separate the 48-bit address into the OUI and the vendor serial number.


13 Refer to the exhibit. The network administrator has assigned the internetwork of LBMISS an address range of 192.168.10.0. This address range has been subnetted using a /29 mask. In order to accommodate a new building, the technician has decided to use the fifth subnet for configuring the new network. By company policies, the router interface is always assigned the first usable host address and the workgroup server is given the last usable host address. Which configuration should be entered into the IP server properties to get connectivity to the network through the router?


IP address: 192.168.10.38 Subnet mask: 255.255.255.240 Default gateway: 192.168.10.39
IP address: 192.168.10.38 Subnet mask: 255.255.255.240 Default gateway: 192.168.10.33
*IP address: 192.168.10.38 Subnet mask: 255.255.255.248 Default gateway: 192.168.10.33
IP address: 192.168.10.39 Subnet mask: 255.255.255.248 Default gateway: 192.168.10.31
IP address: 192.168.10.254 Subnet mask: 255.255.255.0 Default gateway: 192.168.10.1
14 Which statements describe Layer 2 and Layer 3 packet address changes as the packet traverses from router to router? (Choose two.)

Layer 3 header is removed and replaced at every Layer 3 device.
Layer 2 and Layer 3 addresses do not change when the packet traverse.
* Layer 3 source and destination addresses do not change when the packet traverse.
*Layer 2 frame header and trailer are removed and replaced at every Layer 3 device.
Layer 2 source and destination addresses do not change when the packet travels.



15 Which type of routing uses manual entry of information and does not scale well in large internetworks?

interior
exterior
*static
dynamic




16 Given a host with the IP address 172.32.65.13 and a default subnet mask, to which network does the host belong?

172.32.65.0
172.32.65.32
*172.32.0.0
172.32.32.0


17 How does subnetting provide some level of security in a network?

The number of switches must increase.
The collisions prevent the copying of data.
*The broadcasts are contained within a subnet.
The number of host IP addresses is increased.



18 What header address information does a router change in the information it receives from an attached Ethernet interface before information is transmitted out another interface?

only the Layer 2 source address
only the Layer 2 destination address
only the Layer 3 source address
only the Layer 3 destination address
*the Layer 2 source and destination address
the Layer 3 source and destination address



19 At which layer of the OSI model does the device reside that is functioning as the default gateway for hosts on a network?

Layer 1
Layer 2
*Layer 3
Layer 4
Layer 5
Layer 7
20 What is the primary purpose of the routing process?

to propagate broadcast messages
to map IP addresses to MAC addresses
to switch traffic to all available interfaces
to map IP addresses to MAC addresses
*to find paths from one network or subnet to another


21 Refer to the exhibit. A technician is planning an addressing scheme for a branch office as shown in the exhibit. What is the status of the intended network?

The configuration will work as planned.
The subnetwork mask of host A is incorrect.
The default gateway of host A is a network address.
*The addresses on the router LAN interfaces are on the same subnetwork.
The IP address of host A is on a different subnetwork than the subnetwork that the Ethernet router interface is on.


22 Which type of routing allows routers to adapt to network changes?

static routes
* dynamic routing
only default routes
No routing is necessary.


23 Refer to the exhibit. After host 2 is connected to the switch on the LAN, host 2 is unable to communicate with host 1. What is the cause of this problem?

The subnet mask of host 2 is incorrect.
*Host 1 and host 2 are on different networks.
The switch needs an IP address that is not configured.
The router LAN interface and host 1 are on different networks.
The IP address of host 1 is on a different network than is the LAN interface of the router.

24 A company is planning to subnet its network for a maximum of 27 hosts. Which subnet mask would provide the needed hosts and leave the fewest unused addresses in each subnet?

255.255.255.0
255.255.255.192
* 255.255.255.224
255.255.255.240
255.255.255.248




25 An IP network address has been subnetted so that every subnetwork has 14 usable host IP addresses. What is the appropriate subnet mask for the newly created subnetworks?

255.255.255.128
255.255.255.224
*255.255.255.240
255.255.255.248
255.255.255.252

26 What is the primary purpose of a routing protocol?
to propagate broadcast messages
to map IP addresses to MAC addresses
to switch traffic to all available interfaces
*sharing network information between routers