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2021 Mar 100-105 sample question

Q51. - (Topic 3) 

Which three statements are correct about RIP version 2? (Choose three) 

A. It uses broadcast for its routing updates. 

B. It supports authentication. 

C. It is a classless routing protocol. 

D. It has a lower default administrative distance then RIP version 1. 

E. It has the same maximum hop count as RIP version 1. 

F. It does not send the subnet mask any updates. 

Answer: B,C,E 

Explanation: 

A and E are correct according to the theory of RIP. 

RIP version 1 updates are broadcasts, and RIP version 2 updates are multicast to 

224.0.0.9 -> B is not correct. 

RIP v1 is a classful routing protocol but RIP v2 is a classless routing protocol -> C is 

correct. 

RIPv1 and RIPv2 have the same default administrative distance of 120 -> D is not correct. 

RIPv2 is a classless routing protocol so it does send the subnet mask in updates -> F is not 

correct. 


Q52. - (Topic 5) 

Refer to the exhibit. 

The network administrator made the entries that are shown and then saved the configuration. From a console connection, what password or password sequence is required for the administrator to access privileged mode on Router1? 

A. cisco 

B. sanfran 

C. sanjose 

D. either cisco or sanfran 

E. either cisco or sanjose 

F. sanjose and sanfran 

Answer: B 

Explanation: 

The enable secret password takes precedence over the enable password, so sanfran will be used. 


Q53. - (Topic 3) 

An administrator is in the process of changing the configuration of a router. What command will allow the administrator to check the changes that have been made prior to saving the new configuration? 

A. Router# show startup-config 

B. Router# show current-config 

C. Router# show running-config 

D. Router# show memory 

E. Router# show flash 

F. Router# show processes 

Answer: C 

Explanation: 

This command followed by the appropriate parameter will show the running config hence the admin will be able to see what changes have been made, and then they can be saved. 


Q54. - (Topic 3) 

What is the OSPF default frequency, in seconds, at which a Cisco router sends hello packets on a multi-access network? 

A. 10 

B. 40 

C. 30 

D. 20 

Answer: A 

Explanation: 

On broadcast multiacess and point-to-point links, the default is 10 seconds. On NBMA, the default is 30 seconds. 


Q55. - (Topic 3) 

Which statement is true? 

A. An IPv6 address is 64 bits long and is represented as hexadecimal characters. 

B. An IPv6 address is 32 bits long and is represented as decimal digits. 

C. An IPv6 address is 128 bits long and is represented as decimal digits. 

D. An IPv6 address is 128 bits long and is represented as hexadecimal characters. 

Answer: D 

Explanation: 

http://www.cisco.com/en/US/technologies/tk648/tk872/technologies_white_paper0900aecd 8026003d.pdf 

One of the key advantages IPv6 brings is the exponentially larger address space. The following will outline the basic address architecture of IPv6. 128-bit-long addresses Represented in hexadecimal format: Uses CIDR principles: prefix/prefix length x:x:x:x:x:x:x:x, where x is a 16-bit hex field The last 64 bits are used for the interface ID 


Improved 100-105 torrent:

Q56. - (Topic 2) 

Which two options will help to solve the problem of a network that is suffering a broadcast storm? (Choose two.) 

A. a bridge 

B. a router 

C. a hub 

D. a Layer 3 switch 

E. an access point 

Answer: B,D 

Explanation: 

Routers and layer 3 switches will not propagate broadcast traffic beyond the local segment, so the use of these devices is the best method for eliminating broadcast storms. 


Q57. - (Topic 3) 

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 

Answer: D 

Explanation: 

255.255.224 equal /19 in CIDR format hence the answer 


Q58. - (Topic 1) 

At which layer of the OSI model does the protocol that provides the information that is displayed by the show cdp neighbors command operate? 

A. application 

B. transport 

C. network 

D. physical 

E. data link 

Answer: E 

Explanation: 

CDP is a device discovery protocol that runs over Layer 2 (the data link layer) on all Cisco-manufactured devices (routers, bridges, access servers, and switches) and allows network management applications to discover Cisco devices that are neighbors of already known devices. With CDP, network management applications can learn the device type and the Simple Network Management Protocol (SNMP) agent address of neighboring devices running lower-layer, transparent protocols. CDP allows devices to share basic configuration information without even configuring any protocol specific information and is enabled by default on all interfaces. CDP is a Datalink Protocol occurring at Layer 2 of the OSI model. CDP is not routable and can only go over to directly connected devices. CDP is enabled, by default, on all Cisco devices. CDP updates are generated as multicasts every 60 seconds with a hold-down period of 180 seconds for a missing neighbor. The no cdp run command globally disables CDP, while the no cdp enable command disables CDP on an interface. Use show cdp neighbors to list out your directly connected Cisco neighboring devices. Adding the detail parameter will display the layer-3 addressing configured on the neighbor. 

Reference: http://computernetworkingnotes.com/cisco-devices-administration-and-configuration/cisco-discoveryprotocol.html 


Q59. - (Topic 7) 

Which entity assigns IPv6 addresses to end users? 

A. ICANN 

B. APNIC 

C. RIR 

D. ISPs 

Answer: C 


Q60. - (Topic 5) 

Refer to the exhibit. 

A TFTP server has recently been installed in the Atlanta office. The network administrator is located in the NY office and has made a console connection to the NY router. After establishing the connection they are unable to backup the configuration file and IOS of the NY router to the TFTP server. What is the cause of this problem? 

A. The NY router has an incorrect subnet mask. 

B. The TFTP server has an incorrect IP address. 

C. The TFTP server has an incorrect subnet mask. 

D. The network administrator computer has an incorrect IP address. 

Answer: C 

Explanation: 

The TFTP server is using a mask of 255.255.255.240 (/28) while the router is configured with a /29. Because of this, the Atlanta router does not see the TFTP server as being in the same subnet.