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2021 Apr 100-105 exams

Q41. - (Topic 4) 

A network administrator cannot connect to a remote router by using SSH. Part of the show interfaces command is shown. 

router#show interfaces 

Serial0/1/0 is up, line protocol is down 

At which OSI layer should the administrator begin troubleshooting? 

A. physical 

B. data link 

C. network 

D. transport 

Answer: B 

Explanation: 

https://learningnetwork.cisco.com/thread/12389 

I think the indication here is "Serial 0 is up, line protocol is down". What causes this indication? Correct me if I am wrong. When you have this indication, a cable unplugged is not a correct answer. If you check the output of your "show interface serial 0" command again, you should notice it as "Serial 0 is down, line protocol is down. Under the "show ip int brief" you should see status = down and protocol = down as opposed to up, down. Because you disconnected the cable, layer 1 will go down, which is indicated by the serial 0 down status. The line protocol status is for layer 2. So, a cable unplugged is not a correct answer to "Serial 0 is up, line protocol is down". Up/down means that the physical layer is OK, but there is a problem with the data link link (line protocol). 


Q42. - (Topic 3) 

Refer to the exhibit. 

If CDP is enabled on all devices and interfaces, which devices will appear in the output of a show cdp neighbors command issued from R2? 

A. R2 and R3 

B. R1 and R3 

C. R3 and S2 

D. R1, S1, S2, and R3 

E. R1, S1, S2, R3, and S3 

Answer: C 

Explanation: 

A Cisco device enabled with CDP sends out periodic interface updates to a multicast address in order to make itself known to neighbors. Since it is a layer two protocol, these packets are not routed. So the devices detected would be immediate connected neighbors. 


Q43. - (Topic 5) 

Refer to the exhibit. 

Serial 0/0 does not respond to a ping request from a host on the FastEthernet 0/0 LAN. How can this problem be corrected? 

A. Enable the Serial 0/0 interface. 

B. Correct the IP address for Serial 0/0. 

C. Correct the IP address for FastEthernet 0/0 

D. Change the encapsulation type on Serial 0/0 

E. Enable autoconfiguration on the Serial 0/0 interface 

Answer: A 

Explanation: 

Serial 0/0 interface is administratively down therefore, you will have to run the "no shutdown" command to enable the interface for data. 


Q44. - (Topic 1) 

What are two common TCP applications? (Choose two.) 

A. TFTP 

B. SMTP 

C. SNMP 

D. FTP 

E. DNS 

Answer: B,D 

Explanation: 

SMTP uses TCP port 25, while FTP uses TCP ports 20 and 21. 

Reference: http://pentestlab.wordpress.com/2012/03/05/common-tcpip-ports/ 


Q45. - (Topic 3) 

Which two statements describe characteristics of IPv6 unicast addressing? (Choose two.) 

A. Global addresses start with 2000::/3. 

B. Link-local addresses start with FE00:/12. 

C. Link-local addresses start with FF00::/10. 

D. There is only one loopback address and it is ::1. 

E. If a global address is assigned to an interface, then that is the only allowable address for the interface. 

Answer: A,D 


Replace 100-105 free exam:

Q46. - (Topic 5) 

How can you ensure that only the MAC address of a server is allowed by switch port Fa0/1? 

A. Configure port Fa0/1 to accept connections only from the static IP address of the server. 

B. Configure the server MAC address as a static entry of port security. 

C. Use a proprietary connector type on Fa0/1 that is incomputable with other host connectors. 

D. Bind the IP address of the server to its MAC address on the switch to prevent other hosts from spoofing the server IP address. 

Answer: B 

Explanation: 

When the MAC address is configured as static entry, no other address is allowed. 


Q47. - (Topic 3) 

Refer to the exhibit. 

The network is converged.After link-state advertisements are received from Router_A, what information will Router_E contain in its routing table for the subnets 208.149.23.64 and 208.149.23.96? 

A. 208.149.23.64[110/13] via 190.173.23.10, 00:00:07, FastEthemet0/0 208.149.23.96[110/13] via 190.173.23.10, 00:00:16, FastEthemet0/0 

B. 208.149.23.64[110/1] via 190.172.23.10, 00:00:07, Serial1/0 208.149.23.96[110/3] via 190.173.23.10, 00:00:16, FastEthemet0/0 

C. 208.149.23.64[110/13] via 190.173.23.10, 00:00:07, Serial1/0 208.149.23.96[110/13] via 190.173.23.10, 00:00:16, Serial1/0 208.149.23.96[110/13] via 190.173.23.10, 00:00:16, FastEthemet0/0 

D. 208.149.23.64[110/3] via 190.172.23.10, 00:00:07, Serial1/0 208.149.23.96[110/3] via 190.173.23.10, 00:00:16, Serial1/0 

Answer: A 

Explanation: 

Router_E learns two subnets subnets 208.149.23.64 and 208.149.23.96 via Router_A 

through FastEthernet interface. The interface cost is calculated with the formula 108 / 

Bandwidth. For FastEthernet it is 108 / 100 Mbps = 108 / 100,000,000 = 1. Therefore the 

cost is 12 (learned from Router_A) + 1 = 13 for both subnets -> 

The cost through T1 link is much higher than through T3 link (T1 cost = 108 / 1.544 Mbps = 

64; T3 cost = 108 / 45 Mbps = 2) so surely OSPF will choose the path through T3 link -> 

Router_E will choose the path from Router_A through FastEthernet0/0, not Serial1/0. 

In fact, we can quickly eliminate answers B, C and D because they contain at least one 

subnet learned from Serial1/0 -> they are surely incorrect. 


Q48. - (Topic 5) 

Select two options which are security Issues which need to be modified before RouterA is used? (Choose two.) 

A. unencrypted weak password is configured to protect privilege mode 

B. inappropriate wording in banner message 

C. the virtual terminal lines have a weak password configured 

D. virtual terminal lines have a password, but it will not be used 

E. configuration supports un-secure web server access 

Answer: B,D 


Q49. DRAG DROP - (Topic 5) 

Drag the appropriate command on the left to the configuration task it accomplishes. (Not all options are used.) 

Answer: 


Q50. - (Topic 4) 

How many addresses will be available for dynamic NAT translation when a router is configured with the following commands? 

Router(config)#ip nat pool TAME 209.165.201.23 209.165.201.30 netmask 

255.255.255.224 

Router(config)#ip nat inside source list 9 pool TAME 

A. 7 

B. 8 

C. 9 

D. 10 

E. 24 

F. 32 

Answer: B 

Explanation: 

209.165.201.23 to 209.165.201.30 provides for 8 addresses.