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2021 Nov 100-105 exam fees

Q161. - (Topic 5) 

Two routers named Atlanta and Brevard are connected by their serial interfaces as shown in the exhibit, but there is no data connectivity between them. The Atlanta router is known to have a correct configuration. 

Given the partial configurations shown in the exhibit, what is the problem on the Brevard router that is causing the lack of connectivity? 

A. A loopback is not set. 

B. The IP address is incorrect. 

C. The subnet mask is incorrect. 

D. The serial line encapsulations are incompatible. 

E. The maximum transmission unit (MTU) size is too large. 

F. The bandwidth setting is incompatible with the connected interface. 

Answer:

Explanation: 

The connection between two routers must have IP addresses that belong to the same subnet, but in this case Atlanta is using 192.168.10.1/24 and the other is in 192.168.11.1/24. 


Q162. - (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 


Q163. - (Topic 3) 

Refer to the exhibit. 

Which two statements are true about the loopback address that is configured on RouterB? (Choose two.) 

A. It ensures that data will be forwarded by RouterB. 

B. It provides stability for the OSPF process on RouterB. 

C. It specifies that the router ID for RouterB should be 10.0.0.1. 

D. It decreases the metric for routes that are advertised from RouterB. 

E. It indicates that RouterB should be elected the DR for the LAN. 

Answer: B,C 

Explanation: 

A loopback interface never comes down even if the link is broken so it provides stability for the OSPF process (for example we use that loopback interface as the router-id) -The router-ID is chosen in the order below: 

+

 The highest IP address assigned to a loopback (logical) interface. 

+

 If a loopback interface is not defined, the highest IP address of all active router’s physical interfaces will be chosen. -> The loopback interface will be chosen as the router ID of RouterB -


Abreast of the times 100-105 exam fees:

Q164. - (Topic 5) 

What are two recommended ways of protecting network device configuration files from outside network security threats? (Choose two.) 

A. Allow unrestricted access to the console or VTY ports. 

B. Use a firewall to restrict access from the outside to the network devices. 

C. Always use Telnet to access the device command line because its data is automatically encrypted. 

D. Use SSH or another encrypted and authenticated transport to access device configurations. 

E. Prevent the loss of passwords by disabling password encryption. 

Answer: B,D 

Explanation: 

Using a firewall is a must for networks of any size to protect the internal network from outside threats and unauthorized access. SSH traffic is encrypted while telnet is not, so it is always recommended to use SSH. 


Q165. - (Topic 2) 

How many simultaneous Telnet sessions does a Cisco router support by default? 

A. 1 

B. 2 

C. 3 

D. 4 

E. 5 

F. 6 

Answer:

Explanation: 

By default, Cisco routers support virtual terminal interfaces 0-4 (5 total) which are used for telnet sessions. 


Q166. - (Topic 2) 

A switch has 48 ports and 4 VLANs. How many collision and broadcast domains exist on the switch (collision, broadcast)? 

A. 4, 48 

B. 48, 4 

C. 48, 1 

D. 1, 48 

E. 4, 1 

Answer:

Explanation: 

A switch uses a separate collision domain for each port, and each VLAN is a separate broadcast domain. 

Topic 3, Routing Fundamentals 


Q167. - (Topic 1) 

Refer to the exhibit. 

The exhibit is showing the topology and the MAC address table. Host A sends a data frame to host D. What will the switch do when it receives the frame from host A? 

A. The switch will add the source address and port to the MAC address table and forward the frame to host D. 

B. The switch will discard the frame and send an error message back to host A. 

C. The switch will flood the frame out of all ports except for port Fa0/3. 

D. The switch will add the destination address of the frame to the MAC address table and forward the frame to host D. 

Answer:

Explanation: 

When switch receives the data frame from the host not having the MAC address already on the MAC table, it will add the MAC address to source port on MAC address table and sends the data frame.