How 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
Which device would add security to a
network by not forwarding broadcasts?
hub
router
switch
bridge
repeater
3
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
4
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
5
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.
6
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.
7
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 จC 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.
8
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.
9
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.
10
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.
11
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
12
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.
13
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
14
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.
15
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.
16
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
17
Which type of routing uses manual entry of
information and does not scale well in large
internetworks?
interior
exterior
static
dynamic
18
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
19
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
20
Which type of routing allows routers to
adapt to network changes?
static routes
dynamic routing
only default
routes
No routing is
necessary.
21
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 (subnet
zero is the first subnet). 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 workgroup server's properties to allow
connectivity to the network?
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
22
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
23
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
24
Which address is a valid subnet if a 26
bit mask is used for subnetting?
172.16.43.16
172.16.128.32
172.16.243.64
172.16.157.96
172.16.47.224
172.16.192.252
25
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.
