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Q51. - (Topic 3) 

Which one of the following IP addresses is the last valid host in the subnet using mask 255.255.255.224? 

A. 192.168.2.63 

B. 192.168.2.62 

C. 192.168.2.61 

D. 192.168.2.60 

E. 192.168.2.32 

Answer:

Explanation: 

With the 224 there are 8 networks with increments of 32 One of these is 32 33 62 63 where 63 is broadcast so 62 is last valid host out of given choices. 


Q52. - (Topic 3) 

What OSPF command, when configured, will include all interfaces into area 0? 

A. network 0.0.0.0 255.255.255.255 area 0 

B. network 0.0.0.0 0.0.0.0 area 0 

C. network 255.255.255.255 0.0.0.0 area 0 

D. network all-interfaces area 0 

Answer:

Explanation: 

Example 3-1 displays OSPF with a process ID of 1 and places all interfaces configured with an IP address in area 0. The network command.network 0.0.0.0 255.255.255.255 area 0.dictates that you do not care (255.255.255.255) what the IP address is, but if an IP address is enabled on any interface, place it in area 0. 

Example 3-1.Configuring OSPF in a Single Area 

router ospf 1 network 0.0.0.0 255.255.255.255 area 0 

Reference: http://www.ciscopress.com/articles/article.asp?p=26919&seqNum=3 


Q53. - (Topic 3) 

If an Ethernet port on a router was assigned an IP address of 172.16.112.1/20, what is the maximum number of hosts allowed on this subnet? 

A. 1024 

B. 2046 

C. 4094 

D. 4096 

E. 8190 

Answer:

Explanation: 

Each octet represents eight bits. The bits, in turn, represent (from left to right): 128, 64, 32 , 16 , 8, 4, 2, 1 Add them up and you get 255. Add one for the all zeros option, and the total is 256. Now, take away one of these for the network address (all zeros) and another for the broadcast address (all ones). Each octet represents 254 possible hosts. Or 254 possible networks. Unless you have subnet zero set on your network gear, in which case you could conceivably have 255. The CIDR addressing format (/20) tells us that 20 bits are used for the network portion, so the maximum number of networks are 2^20 minus one if you have subnet zero enabled, or minus 2 if not. You asked about the number of hosts. That will be 32 minus the number of network bits, minus two. So calculate it as (2^(32-20))-2, or (2^12)-2 = 4094 


Q54. - (Topic 1) 

A workstation has just resolved a browser URL to the IP address of a server. What protocol will the workstation now use to determine the destination MAC address to be placed into frames directed toward the server? 

A. HTTP 

B. DNS 

C. DHCP 

D. RARP 

E. ARP 

Answer:

Explanation: 

The RARP protocol is used to translate hardware interface addresses to protocol addresses. The RARP message format is very similar to the ARP format. When the booting computer sends the broadcast ARP request, it places its own hardware address in both the sending and receiving fields in the encapsulated ARP data packet. The RARP server will fill in the correct sending and receiving IP addresses in its response to the message. This way the booting computer will know its IP address when it gets the message from the RARP server 


Q55. CORRECT TEXT - (Topic 6) 

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

Drag the appropriate device icons to the labeled Device Drag 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 consolepw 

Set the password to allow telnet access to telnetpw 

Set the password to allow privilege mode access to privpw 

Not E: 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 

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 the bottom-right is a straight-through 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 cable Two 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 & 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 Then set the console, telnet and privilege mode passwords for Router2 as we did for Router1, remember to save the configuration when you finished. 


Q56. - (Topic 3) 

What is the default administrative distance of the OSPF routing protocol? 

A. 90 

B. 100 

C. 110 

D. 120 

E. 130 

F. 170 

Answer:

Explanation: 

Default Distance Value Table This table lists the administrative distance default values of the protocols that Cisco supports: If the administrative distance is 255, the router does not believe the source of that route and does not install the route in the routing table. 


Q57. - (Topic 2) 

Refer to the exhibit. 

What two things can the technician determine by successfully pinging from this computer to the IP address 172.16.236.1? (Choose two) 

A. The network card on the computer is functioning correctly. 

B. The default static route on the gateway router is correctly configured. 

C. The correct default gateway IP address is configured on the computer. 

D. The device with the IP address 172.16.236.1 is reachable over the network. 

E. The default gateway at 172.16.236.1 is able to forward packets to the internet. 

Answer: A,D 

Explanation: 

The source and destination addresses are on the same network therefore, a default gateway is not necessary for communication between these two addresses. 


Q58. - (Topic 7) 

Which statement about the inside interface configuration in a NAT deployment is true? 

A. It is defined globally 

B. It identifies the location of source addresses for outgoing packets to be translated using access or route maps. 

C. It must be configured if static NAT is used 

D. It identifies the public IP address that traffic will use to reach the internet. 

Answer:

Explanation: 

This module describes how to configure Network Address Translation (NAT) for IP address conservation and how to configure inside and outside source addresses. This module also provides information about the benefits of configuring NAT for IP address conservation. NAT enables private IP internetworks that use nonregistered IP addresses to connect to the Internet. NAT operates on a device, usually connecting two networks, and translates the private (not globally unique) addresses in the internal network into legal addresses before packets are forwarded onto another network. NAT can be configured to advertise to the outside world only one address for the entire network. This ability provides additional security by effectively hiding the entire internal network behind that one address. NAT is also used at the enterprise edge to allow internal users access to the Internet and to allow Internet access to internal devices such as mail servers. 


Q59. - (Topic 3) 

Refer to the exhibit. 

Which command would you use to configure a static route on Router1 to network 192.168.202.0/24 with a nondefault administrative distance? 

A. router1(config)#ip route 1 192.168.201.1 255.255.255.0 192.168.201.2 

B. router1(config)#ip route 192.168.202.0 255.255.255.0 192.168.201.2 1 

C. router1(config)#ip route 5 192.168.202.0 255.255.255.0 192.168.201.2 

D. router1(config)#ip route 192.168.202.0 255.255.255.0 192.168.201.2 5 

Answer:

Explanation: 

The default AD for a static route is 1. To change this, configure a different value to be used as the AD at the very end of the “ip route” statement. 


Q60. - (Topic 7) 

Which value is indicated by the next hop in a routing table? 

A. preference of the route source 

B. IP address of the remote router for forwarding the packets 

C. how the route was learned 

D. exit interface IP address for forwarding the packets 

Answer:

Explanation: 

The routing table contains network/next hop associations. These associations tell a router that a particular destination can be optimally reached by sending the packet to a specific router that represents the "next hop" on the way to the final destination. The next hop association can also be the outgoing or exit interface to the final destination.