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Q131. - (Topic 3) 

Scenario 

Refer to the topology. Your company has decided to connect the main office with three other remote branch offices using point-to-point serial links. 

You are required to troubleshoot and resolve OSPF neighbor adjacency issues between the main office and the routers located in the remote branch offices. 

An OSPF neighbor adjacency is not formed between R3 in the main office and R6 in the Branch3 office. What is causing the problem? 

A. There is an area ID mismatch. 

B. There is a PPP authentication issue; the username is not configured on R3 and R6. 

C. There is an OSPF hello and dead interval mismatch. 

D. The R3 router ID is configured on R6. 

Answer:

Explanation: 

Using the show running-config command we see that R6 has been incorrectly configured with the same router ID as R3 under the router OSPF process. 


Q132. - (Topic 5) 

What is the effect of using the service password-encryption command? 

A. Only the enable password will be encrypted. 

B. Only the enable secret password will be encrypted. 

C. Only passwords configured after the command has been entered will be encrypted. 

D. It will encrypt the secret password and remove the enable secret password from the 

configuration. 

E. It will encrypt all current and future passwords. 

Answer:

Explanation: 

Encryption further adds a level of security to the system as anyone having access to the database of passwords cannot reverse the process of encryption to know the actual passwords which isn’t the case if the passwords are stored simply. 


Q133. - (Topic 5) 

Refer to the exhibit. 

A technician pastes the configurations in the exhibit into the two new routers shown. Otherwise, the routers are configured with their default configurations. 

A ping from Host1 to Host 2 fails, but the technician is able to ping the S0/0 interface of R2 from Host 1. The configurations of the hosts have been verified as correct. What could be the cause of the problem? 

A. The serial cable on R1 needs to be replaced. 

B. The interfaces on R2 are not configured properly 

C. R1 has no route to the 192.168.1.128 network. 

D. The IP addressing scheme has overlapping subnetworks. 

E. The ip subnet-zero command must be configured on both routers. 

Answer:

Explanation: 

Without a static route pointing to the host 2 network the router R1 is unaware of the path to take to reach that network and reply traffic cannot be sent. 


Q134. - (Topic 3) 

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. 

Answer: A,C 

Explanation: 

This is obviously the default 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. 


Q135. - (Topic 3) 

Which commands are required to properly configure a router to run OSPF and to add network 192.168.16.0/24 to OSPF area 0? (Choose two.) 

A. Router(config)# router ospf 0 

B. Router(config)# router ospf 1 

C. Router(config)# router ospf area 0 

D. Router(config-router)# network 192.168.16.0 0.0.0.255 0 

E. Router(config-router)# network 192.168.16.0 0.0.0.255 area 0 

F. Router(config-router)# network 192.168.16.0 255.255.255.0 area 0 

Answer: B,E 

Explanation: 

In the router ospf command, the ranges from 1 to 65535 so o is an invalid number -> but To configure OSPF, we need a wildcard in the “network” statement, not a subnet mask. We also need to assgin an area to this process. 


Q136. - (Topic 2) 

Refer to the exhibit. 

The MAC address table is shown in its entirety. The Ethernet frame that is shown arrives at 

the switch. 

What two operations will the switch perform when it receives this frame? (Choose two.) 

A. The switch will not forward a frame with this destination MAC address. 

B. The MAC address of 0000.00aa.aaaa will be added to the MAC Address Table. 

C. The MAC address of ffff.ffff.ffff will be added to the MAC address table. 

D. The frame will be forwarded out of all the active switch ports except for port fa0/0. 

E. The frame will be forwarded out of fa0/0 and fa0/1 only. 

F. The frame will be forwarded out of all the ports on the switch. 

Answer: B,D 

Explanation: 

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. 


Q137. - (Topic 4) 

What happens when computers on a private network attempt to connect to the Internet through a Cisco router running PAT? 

A. The router uses the same IP address but a different TCP source port number for each connection. 

B. An IP address is assigned based on the priority of the computer requesting the connection. 

C. The router selects an address from a pool of one-to-one address mappings held in the lookup table. 

D. The router assigns a unique IP address from a pool of legally registered addresses for the duration of the connection. 

Answer:

Reference: 

http://www.cisco.com/en/US/docs/security/asa/asa82/configuration/guide/nat_staticpat.html 

Static PAT translations allow a specific UDP or TCP port on a global address to be translated to a specific port on a local address. That is, both the address and the port numbers are translated. 

Static PAT is the same as static NAT, except that it enables you to specify the protocol (TCP or UDP) and port for the real and mapped addresses. Static PAT enables you to identify the same mapped address across many different static statements, provided that the port is different for each statement. You cannot use the same mapped address for multiple static NAT statements. 

Port Address Translation makes the PC connect to the Internet but using different TCP source port. 


Q138. - (Topic 1) 

A network administrator is connecting PC hosts A and B directly through their Ethernet interfaces as shown in the graphic. Ping attempts between the hosts are unsuccessful. What can be done to provide connectivity between the hosts? (Choose two.) 

A. A crossover cable should be used in place of the straight-through cable. 

B. A rollover cable should be used in place of the straight-through cable. 

C. The subnet masks should be set to 255.255.255.192 

D. A default gateway needs to be set on each host. 

E. The hosts must be reconfigured to use private IP addresses for direct connections of this type. 

F. The subnet masks should be set to 255.255.255.0 

Answer: A,F 

Explanation: 

If you need to connect two computers but you don't have access to a network and can't set up an ad hoc network, you can use an Ethernet crossover cable to create a direct cable connection. Generally speaking, a crossover cable is constructed by reversing (or crossing over) the order of the wires inside so that it can connect two computers directly. A crossover cable looks almost exactly like a regular Ethernet cable (a straight-through cable), so make sure you have a crossover cable before following these steps. 

Both devices need to be on the same subnet, and since one PC is using 192.1.1.20 and the other is using 192.1.1.201, the subnet mask should be changed to 255.255.255.0. 


Q139. - (Topic 3) 

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. 

Answer:

Explanation: 

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


Q140. - (Topic 5) 

Refer to the exhibit. 

Why was this message received? 

A. No VTY password has been set. 

B. No enable password has been set. 

C. No console password has been set. 

D. No enable secret password has been set. 

E. The login command has not been set on CON 0 

F. The login command has not been set on the VTY ports. 

Answer:

Explanation: 

Your CCNA certification exam is likely going to contain questions about Telnet, an application-level protocol that allows remote communication between two networking devices. With Telnet use being as common as it is, you had better know the details of how to configure it in order to pass your CCNA exam and to work in real-world networks. 

The basic concept is pretty simple - we want to configure R1, but we're at R2. If we telnet successfully to R1, we will be able to configure R1 if we've been given the proper permission levels. In this CCNA case study, R2 has an IP address of 172.12.123.2 and R1 an address of 172.12.123.1. Let's try to telnet from R2 to R1. 

R2#telnet 172.12.123.1 Trying 172.12.123.1 ... Open Password required, but none set [Connection to 172.12.123.1 closed by foreign host] 

This seems like a problem, but it's a problem we're happy to have. A Cisco router will not let any user telnet to it by default. That's a good thing, because we don't want just anyone connecting to our router! The "password required" message means that no password has been set on the VTY lines on R1. Let's do so now. 

R1(config)#line vty 0 4 

R1(config-line)#password baseball 

A password of "baseball" has been set on the VTY lines, so we shouldn't have any trouble using Telnet to get from R2 to R1. Let's try that now. 

R2#telnet 172.12.123.1 

Trying 172.12.123.1 ... Open 

User Access Verification 

Password: 

R1> 

We're in, and placed into user exec mode. 

Reference: 

http://www.mcmcse.com/cisco/guides/telnet_passwords_and_privilege_levels.shtml