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The latest Cisco CCNA 100-105 exam practice questions test your strength
Which two statements about prefixes in a routing table are true? (Choose two.)
A. The router prefers longer prefixes over shorter prefixes.
B. The router prefers prefixes that have more bit positions for the host than for the network.
C. The router prefers the prefix that includes the most 1 bits in the subnet mask.
D. The router prefers shorter prefixes over longer prefixes.
E. The router prefers the prefix that includes the most 0 bits in the subnet mask.
Correct Answer: AC
Which statement about port security is true?
A. It is not supported on private VLANs.
B. It can be configured on SPAN destination ports.
C. The default port security configuration allows for a maximum of 10 MAC addresses.
D. In sticky mode, the port retains dynamically-learned addresses during a link failure.
Correct Answer: D
Which Layer 1 devices can be used to enlarge the area covered by a single LAN segment? (Choose two.)
F. RJ-45 transceiver
Correct Answer: DE
Lab Simulation – OSPF
The necessary networking has been completed at each location, and the routers have been configured with single area
OSPF as the routing protocol. The Boston router was recently installed but connectivity is not complete because of
incomplete routing tables. Identify and correct any problem you see in the configuration.
Note: The OSPF process must be configured to allow interfaces in specific subnets to participate in the routing process.
The question mentioned Boston router was not configured correctly or incomplete so we should check this router first.
Click on Host B to access the command line interface (CLI) of Boston router.
Boston>enable (type cisco as its password here) Boston#show running-config
Boston# show running-config
router ospf 2
network 192.168.4.0 0.0.0.255 area 0
network 192.168.155.0 0.0.0.3 area 0 !
First, remember that the current OSPF Process ID is 2 because we will need it for later configuration. Next notice that in
the second “network” command the network and wildcard mask are 192.168.155.0 and 0.0.0.3 which is equivalent to
192.168.155.0 255.255.255.252 in term of subnet mask. Therefore this subnetwork\\’s range is from 192.168.155.0 to
192.168.155.3 but the ip address of s0/0 interface of Boston router is192.168.155.5 which don\\’t belong to this range ->
this is the reason why OSPF did not recognize s0 interface of Boston router as a part of area 0. So we need to find a
subnetwork that s0 interface belongs to. IP address of S0 interface: 192.168.155.5/30 Subnet mask: /30 = 1111
1111.1111 1111.1111 1111.1111 1100 Increment: 4 Network address (which IP address of s0 interface belongs to):
192.168.155.4 (because 4 * 1 = 4
Boston(config-router)#no network 192.168.155.0 0.0.0.3 area 0
Boston(config-router)#network 192.168.155.4 0.0.0.3 area 0
Boston#copy running-config startup-config
Finally, you should issue a ping command from Boston router to Lancaster router to make sure it works well.
Drag and Drop Question
Drag and drop the MAC address types from the left onto the correct descriptions on the right?
Select and Place:
Why does a host use a DNS server?
A. To make a DNS client request to server
B. To resolve IP to FQDN
C. To resolve FQDN to IP
D. To assign IP
Correct Answer: C
Which statement describes the effect of the overload keyword in the ip nat inside source list 90 interface ethernet 0/0
A. Addresses that match access list inside are translated to the IP address of the Ethernet 0/0 interface.
B. Hosts that match access list inside are translated to an address in the Ethernet 0/0 network.
C. Hosts on the Ethernet 0/0 LAN are translated to the address pool in access list 90.
D. Addresses that match access list 90 are translated through PAT to the IP address of the Ethernet 0/0 interface.
Correct Answer: D
Which header field is new in IPv6?
A. Hop Limit
B. Flow Label
D. Traffic Class
Correct Answer: B
Refer to the exhibit.
An administrator cannot connect from R1 to R2. To troubleshoot this problem, the administrator has entered the
command shown in the exhibit. Based on the output shown, what could be the problem?
A. The serial interface is configured for the wrong frame size.
B. The serial interface does not have a cable attached.
C. The serial interface has the wrong type of cable attached.
D. The serial interface has a full buffer.
E. The serial interface is configured for half duplex.
Correct Answer: C
Since the output is not forthcoming it shows that the type of cable attached is wrong, though the cable is connected
since it shows the cable type. According to the figure DTE cable should connect to R1 on interface but while examining
using show controllers serial 0/0 command it showing that a DCE is connected so the wrong type of cable is being
Which characteristics are representative of a link-state routing protocol? (Choose three.)
A. provides common view of entire topology
B. exchanges routing tables with neighbors
C. calculates shortest path
D. utilizes event-triggered updates
E. utilizes frequent periodic updates
Correct Answer: ACD
Each of routers running link-state routing protocol learns paths to all the destinations in its “area” so we can say
although it is a bit unclear. Link-state routing protocols generate routing updates only (not the whole routing table) when
a change occurs in the network topology so Link-state routing protocol like OSPF uses Dijkstra algorithm to calculate
the shortest path -> . Unlike Distance vector routing protocol (which utilizes frequent periodic updates), link-state routing
protocol utilizes event-triggered updates (only sends update when a change occurs) ->
Which statement describes the effect of the exec-timeout 30 command?
A. The router maintains a user session indefinitely after it is active for 30 seconds.
B. The router disconnects the user session if it is inactive for 30 minutes.
C. The router maintains a user session indefinitely after it is active for 30 minutes.
D. The router disconnects a user session if it is inactive for 30 seconds.
Correct Answer: B
The “exec-timeout” command is used to configure the inactive session timeout on the console port or the virtual
terminal. The syntax of this command is:
exec-timeout minutes [seconds]
Therefore we need to use the “exec-timeout 30” command to set the user inactivity timer to 30 minutes. To set the user
inactivity timer to 30 seconds we use the “exec-timeout 0 30”.
Which command is used to build DHCP pool?
A. ip dhcp conflict
B. ip dhcp-server pool DHCP
C. ip dhcp pool DHCP
D. ip dhcp-client pool DHCP
Correct Answer: C
What does a host on an Ethernet network do when it is creating a frame and it does not have the destination address?
A. drops the frame
B. sends out a Layer 3 broadcast message
C. sends a message to the router requesting the address
D. sends out an ARP request with the destination IP address
Correct Answer: D
Understanding this concept is prime for understanding that when switch receives the data frame from the host not
having the MAC address already in the MAC table, it will add the MAC address to the source port on the MAC address
table and sends the data frame. If the switch already has the MAC address in its table for the destination, it will forward
the frame directly to the destination port. If it was not already in its MAC table, then they frame would have been flooded
out all ports except for the port that it came from.
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