Cisco 100-101 Online Practice Questions and Exam Preparation

Cisco 100-101 Online Questions & Answers

• Question 101:

  Refer to the exhibit.

  

  What is the simplest way to configure routing between the regional office network 10.89.0.0/20 and the corporate network?

  A. router1(config)#ip route 10.89.0.0 255.255.240.0 10.89.16.2
  B. router2(config)#ip route 10.89.3.0 255.255.0.0 10.89.16.2
  C. router1(config)#ip route 10.89.0.0 255.255.240.0 10.89.16.1
  D. router2(config)#ip route 0.0.0.0 0.0.0.0 10.89.16.1
  D. router2(config)#ip route 0.0.0.0 0.0.0.0 10.89.16.1

  ---

  The fourth command makes it possible for all hosts beyond R2 and all hosts beyond R1 to interact with each other, hence it is the most simplest technique.

• Question 102:

  Which statement describes the process ID that is used to run OSPF on a router?

  A. It is globally significant and is used to represent the AS number.
  B. It is locally significant and is used to identify an instance of the OSPF database.
  C. It is globally significant and is used to identify OSPF stub areas.
  D. It is locally significant and must be the same throughout an area.
  B. It is locally significant and is used to identify an instance of the OSPF database.

• Question 103:

  Refer to the exhibit.

  

  HostX is transferring a file to the FTP server. Point A represents the frame as it goes toward the Toronto router. What will the Layer 2 destination address be at this point?

  A. abcd.1123.0045
  B. 192.168.7.17
  C. aabb.5555.2222
  D. 192.168.1.1
  E. abcd.2246.0035
  E. abcd.2246.0035

  ---

  For packets destined to a host on another IP network, the destination MAC address will be the LAN interface of the router. Since the FTP server lies on a different network, the host will know to send the frame to its default gateway, which is Toronto.

• Question 104:

  Which statements describe the routing protocol OSPF? (Choose three.)

  A. It supports VLSM.
  B. It is used to route between autonomous systems.
  C. It confines network instability to one area of the network.
  D. It increases routing overhead on the network.
  E. It allows extensive control of routing updates.
  F. It is simpler to configure than RIP v2.
  A. It supports VLSM.
  C. It confines network instability to one area of the network.
  E. It allows extensive control of routing updates.

  ---

  Routing overhead is the amount of information needed to describe the changes in a dynamic network topology.

  All routers in an OSPF area have identical copies of the topology database and the topology database of one area is hidden from the rest of the areas to reduce routing overhead because fewer routing updates are sent and smaller routing

  trees are computed and maintained (allow extensive control of routing updates and confine network instability to one area of the network).

• Question 105:

  Refer to the exhibit.

  

  When running OSPF, what would cause router A not to form an adjacency with router B?

  A. The loopback addresses are on different subnets.
  B. The values of the dead timers on the routers are different.
  C. Route summarization is enabled on both routers.
  D. The process identifier on router A is different than the process identifier on router B.
  B. The values of the dead timers on the routers are different.

  ---

  To form an adjacency (become neighbor), router A and B must have the same Hello interval, Dead interval and AREA numbers

• Question 106:

  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 half duplex.
  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 is configured for the wrong frame size.
  E. The serial interface has a full buffer.
  C. The serial interface has the wrong type of cable attached.

  ---

  http://www.thebryantadvantage.com/CCNACertificationExamTutorialDirectlyConnectedSerialIn terfaces.htm

  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 used.

• Question 107:

  This topology contains 3 routers and 1 switch. Complete the topology.

  Drag the appropriate device icons to the labeled DeviceDrag the appropriate connections to the locations labeled Connections.Drag the appropriate IP addresses to the locations labeled IP address

  (Hint: use the given host addresses and Main router information)

  To remove a device or connection, drag it away from the topology.

  Use information gathered from the Main router to complete the configuration of any additional routers.

  No passwords are required to access the Main router. The config terminal command has been disabled for the HQ router. The router does not require any configuration.

  

  Configure each additional router with the following: Configure the interfaces with the correct IP address and enable the interfaces. Set the password to allow console access to consolepwSet the password to allow telnet access to telnetpwSet the password to allow privilege mode access to privpw

  Note.

  Because routes are not being added to the configurations, you will not be able to ping through the internetwork.

  All devices have cable autosensing capabilities disabled.

  All hosts are PC's

  Correct Answer. Specify appropriate devices and drag them on the "Device" boxes For the device at the bottom-right box, we notice that it has 2 interfaces Fa0/2 and Fa0/4; moreover the link connects the PC on the right with the device on
  Specify appropriate devices and drag them on the "Device" boxes For the device at the bottom-right box, we notice that it has 2 interfaces Fa0/2 and Fa0/4; moreover the link connects the PC on the right with the device on

  ---

  the bottom-right is a straightthrough link -> it is a switch

  The question stated that this topology contains 3 routers and 1 switch -> two other devices are routers Place them on appropriate locations as following:

  

  Host D and host E will be automatically added after placing two routers. Click on them to access neighboring routers Specify appropriate connections between these devices:

  +

  The router on the left is connected with the Main router through FastEthernet interfaces: use a crossover cable

  +

  The router on the right is connected with the Main router through Serial interfaces: use a serial cable

  +

  The router on the right and the Switch: use a straight-through cable

  +

  The router on the left and the computer: use a crossover cable

  To remember which type of cable you should use, follow these tips:

  -To connect two serial interfaces of 2 routers we use serial cable

  - To specify when we use crossover cable or straight-through cable, we should remember: Group 1: Router, Host, Server Group 2: Hub, Switch

  One device in group 1 + One device in group 2: use straight-through cableTwo devices in the same group: use crossover cable For examplE. we use straight-through cable to connect switch to router, switch to host, hub to host, hub to server... and we use crossover cable to connect switch to switch, switch to hub, router to router, host to host... )

  

  Assign appropriate IP addresses for interfaces:

  From Main router, use show running-config commanD.

  

  (Notice that you may see different IP addresses in the real CCNA exam, the ones shown above are just used for demonstration)

  From the output we learned that the ip address of Fa0/0 interface of the Main router is 192.168.152.177/28. This address belongs to a subnetwork which has: Increment: 16 (/28 = 255.255.255.240 or 1111 1111.1111 1111.1111 1111.1111 0000) Network address: 192.168.152.176 (because 176 = 16 * 11 and 176 < 177) Broadcast address: 192.168.152.191 (because 191 = 176 + 16 - 1) And we can pick up an ip address from the list that belongs to this subnetwork: 192.168.152.190 and assign it to the Fa0/0 interface the router on the left Use the same method for interface Serial0/0 with an ip address of 192.168.152.161 Increment: 16 Network address: 192.168.152.160 (because 160 = 16 * 10 and 160 < 161) Broadcast address: 192.168.152.175 (because 176 = 160 + 16 - 1) -> and we choose 192.168.152.174 for Serial0/0 interface of the router on the right Interface Fa0/1 of the router on the left IP (of the computer on the left) : 192.168.152.129/28 Increment: 16 Network address: 192.168.152.128 (because 128 = 16 * 8 and 128 < 129) Broadcast address: 192.168.152.143 (because 143 = 128 + 16 - 1) -> we choose 192.168.152.142 from the list Interface Fa0/0 of the router on the right IP (of the computer on the left) : 192.168.152.225/28 Increment: 16 Network address: 192.168.152.224 (because 224 = 16 * 14 and 224 < 225) Broadcast address: 192.168.152.239 (because 239 = 224 + 16 - 1) -> we choose 192.168.152.238 from the list Let's have a look at the picture below to summarize Configure two routers on the left and right with these commands:

  

  Router1 = router on the left Assign appropriate IP addresses to Fa0/0 and Fa0/1 interfaces: Router1>enable Router1#configure terminal Router1(config)#interface fa0/0 Router1(config-if)#ip address 192.168.152.190 255.255.255.240 Router1(config-if)#no shutdown Router1(config-if)#interface fa0/1 Router1(config-if)#ip address 192.168.152.142 255.255.255.240 Router1(config-if)#no shutdown Set passwords (configure on two routers)

  +

  Console password: Router1(config-if)#exit Router1(config)#line console 0 Router1(config-line)#password consolepw Router1(config-line)#login Router1(config-line)#exit

  +

  Telnet password: Router1(config)#line vty 0 4 Router1(config-line)#password telnetpw Router1(config-line)#login Router1(config-line)#exit

  +

  Privilege mode password: Router1(config)#enable password privpw Save the configuration: Router1(config)#exit Router1#copy running-config startup-config Configure IP addresses of Router2 (router on the right) Router2>enable Router2#configure terminal Router2(config)#interface fa0/0 Router2(config-if)#ip address 192.168.152.238 255.255.255.240 Router2(config-if)#no shutdown Router2(config-if)#interface serial0/0 Router2(config-if)#ip address 192.168.152.174 255.255.255.240 Router2(config-if)#no shutdown and set console, telnet and privilege mode passwords for Router2 as we did for Router1, remember to save the configuration when you finished

• Question 108:

  Which router command will configure an interface with the IP address 10.10.80.1/19?

  A. router(config-if)# ip address 10.10.80.1/19
  B. router(config-if)# ip address 10.10.80.1 255.255.0.0
  C. router(config-if)# ip address 10.10.80.1 255.255.255.0
  D. router(config-if)# ip address 10.10.80.1 255.255.224.0
  E. router(config-if)# ip address 10.10.80.1 255.255.240.0
  F. router(config-if)# ip address 10.10.80.1 255.255.255.240
  D. router(config-if)# ip address 10.10.80.1 255.255.224.0

  ---

  255.255.224 equal /19 in CIDR format hence the answer

• Question 109:

  Refer to the exhibit.

  

  A network technician is asked to design a small network with redundancy. The exhibit represents this design, with all hosts configured in the same VLAN. What conclusions can be made about this design?

  A. This design will function as intended.
  B. Spanning-tree will need to be used.
  C. The router will not accept the addressing scheme.
  D. The connection between switches should be a trunk.
  E. The router interfaces must be encapsulated with the 802.1Q protocol.
  C. The router will not accept the addressing scheme.

  ---

  The proposed addressing scheme is on the same network.

• Question 110:

  Refer to the exhibit.

  

  Which two statements are correct? (Choose two.)

  A. This is a default route.
  B. Adding the subnet mask is optional for the ip route command.
  C. This will allow any host on the 172.16.1.0 network to reach all known destinations beyond RouterA.
  D. This command is incorrect, it needs to specify the interface, such as s0/0/0 rather than an IP address.
  E. The same command needs to be entered on RouterA so that hosts on the 172.16.1.0 network can reach network 10.0.0.0.
  A. This is a default route.
  C. This will allow any host on the 172.16.1.0 network to reach all known destinations beyond RouterA.

  ---

  This is obviously the default value for the route which is set between the routers and since it is entered in such a manner that it ensures connectivity between the stub network and any host lying beyond RouterA.