Transmission of subnet mask information
On a VLSM 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
·
D. A point-to-point
link uses only two hosts. A /30, or 255.255.255.252, mask provides two hosts
per subnet.
To use VLSM, what
capability must the routing protocols in use possess?
A. Support for multicast
B. Multiprotocol support
C. Transmission of subnet mask information
D. Support for unequal load balancing
·
C. To use VLSM, the
routing protocols in use possess the capability to transmit subnet mask
information.
If Host A is
configured with an incorrect default gateway and all other computers and the
router are known to be configured correctly, which of the following statements
is TRUE?
A. Host A cannot communicate with the router.
B. Host A can communicate with other hosts in the same subnet.
C. Host A can communicate with hosts in other subnets.
D. Host A can communicate with no other systems.
·
B. With an incorrect
gateway, Host A will not be able to communicate with the router or beyond the
router but will be able to communicate within the subnet.
Which of the following
troubleshooting steps, if completed successfully, also confirms the other steps
will succeed as well?
A. ping a remote computer
B. ping the loopback address
C. ping the NIC
D. ping the default gateway
·
Pinging the remote
computer would fail if any of the other tests fail.
When a ping to the
local host IP address fails, what can you assume?
A. The IP address of the local host is incorrect.
B. The IP address of the remote host is incorrect.
C. The NIC is not functional.
D. The IP stack has failed to initialize.
·
C. When a ping to the
local host IP address fails, you can assume the NIC is not functional.
What network service
is the most likely problem if you can ping a computer by IP address but not by
name?
A. DNS
B. DHCP
C. ARP
D. ICMP
What network service
is the most likely problem if you can ping a computer by IP address but not by
name?
A. DNS
B. DHCP
C. ARP
D. ICMP
·
The most likely
problem if you can ping a computer by IP address but not by name is a failure
of DNS.
When you issue the
ping command, what protocol are you using?
A. DNS
B. DHCP
C. ARP
D. ICMP
·
D. When you issue the
ping command, you are using the ICMP protocol.
Which of the following
commands displays the networks traversed on a path to a network destination?
A. ping
B. traceroute
C. pingroute
D. Pathroute
·
B. The traceroute
command displays the networks traversed on a path to a network destination.
What command generated
the output shown below?
Reply from 172.16.10.2: bytes=32 time<1ms TTL=128
Reply from 172.16.10.2: bytes=32 time<1ms TTL=128
Reply from 172.16.10.2: bytes=32 time<1ms TTL=128
Reply from 172.16.10.2: bytes=32 time<1ms TTL=128
A. traceroute
B. show ip route
C. ping
D. pathping
C. The ping command
tests connectivity to another station. The full command is shown below.
C:\>ping 172.16.10.2
Pinging 172.16.10.2 with 32 bytes of data:
Reply from 172.16.10.2: bytes=32 time<1ms TTL=128
Reply from 172.16.10.2: bytes=32 time<1ms TTL=128
Reply from 172.16.10.2: bytes=32 time<1ms TTL=128
Reply from 172.16.10.2: bytes=32 time<1ms TTL=128
Ping statistics for 172.16.10.2:
Packets: Sent = 4, Received = 4, Lost = 0 (0% loss),
Approximate round trip times in milli-seconds:
Minimum = 0ms, Maximum = 0ms, Average = 0ms
Which of the following
network addresses correctly summarizes the three networks shown below
efficiently?
10.0.0.0/16
10.1.0.0/16
10.2.0.0/16
A. 10.0.0.0/15
B. 10.1.0.0/8
C. 10.0.0.0/14
D. 10.0.0.8/16
·
C. The interesting
octet in this example is the second octet, and it is a block size of four
starting at 10.0.0.0. By using a 255.252.0.0 mask, we are telling the summary
to use a block size of four in the 2nd octet. This will cover 10.0.0.0 through
10.3.255.255. This is the best answer.
What command displays
the ARP table on a Cisco router?
A. show ip arp
B. traceroute
C. arp -a
D. Tracert
·
The command that
displays the ARP table on a Cisco router is show ip arp.
What switch must be
added to the ipconfig command on a PC to verify DNS configuration?
A. /dns
B. -dns
C. /all
D. Showall
·
C. The /all switch
must be added to the ipconfig command on a PC to verify DNS configuration.
Which of the following
is the best summarization of the following networks: 192.168.128.0 through
192.168.159.0
A. 192.168.0.0/24
B. 192.168.128.0/16
C. 192.168.128.0/19
D. 192.168.128.0/20
·
C. If you start at
192.168.128.0 and go through 192.168.159.0, you can see this is a block of 32
in the third octet. Since the network address is always the first one in the
range, the summary address is 192.168.128.0. What mask provides a block of 32
in the third octet? The answer is 255.255.224.0, or /19.
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