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2021 Dec 100-105 real exam

Q111. - (Topic 3) 

What is the subnet address for the IP address 172.19.20.23/28? 

A. 172.19.20.0 

B. 172.19.20.15 

C. 172.19.20.16 

D. 172.19.20.20 

E. 172.19.20.32 

Answer:

Explanation: 

From the /28 we can get the following: 

Increment: 16 (/28 = 11111111.11111111.11111111.11110000) 

Network address: 172.19.20.16 (because 16 < 23) 

Broadcast address: 172.16.20.31 (because 31 = 16 + 16 – 1) 


Q112. - (Topic 3) 

An administrator is working with the 192.168.4.0 network, which has been subnetted with a /26 mask. Which two addresses can be assigned to hosts within the same subnet? (Choose two.) 

A. 192.168.4.61 

B. 192.168.4.63 

C. 192.168.4.67 

D. 192.168.4.125 

E. 192.168.4.128 

F. 192.168.4.132 

Answer: C,D 

Explanation: 

Increment: 64 (/26 = 11111111.11111111.11111111.11000000) 

The IP 192.168.4.0 belongs to class C. The default subnet mask of class C is /24 and it has 

been subnetted with a /26 mask so we have 2(26-24).= 22.= 4 sub-networks: 

1st subnet: 192.168.4.0 (to 192.168.4.63) 

2nd subnet: 192.168.4.64 (to 192.168.4.127) 

3rd subnet: 192.168.4.128 (to 192.168.4.191) 

4th subnet: 192.168.4.192 (to 192.168.4.225) 

In all the answers above, only answer C and D are in the same subnet. 

Therefore only IPs in this range can be assigned to hosts. 


Q113. - (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:

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. 


Q114. - (Topic 7) 

Which component of a routing table entry represents the subnet mask? 

A. routing protocol code 

B. prefix 

C. metric 

D. network mask 

Answer:

Explanation: 

IP Routing Table Entry TypesAn entry in the IP routing table contains the following information in the order presented: Network ID. The network ID or destination corresponding to the route. The network ID can be class-based, subnet, or supernet network ID, or an IP address for a host route. Network Mask. The mask that is used to match a destination IP address to the network ID. Next Hop. The IP address of the next hop. Interface. An indication of which network interface is used to forward the IP packet. Metric. A number used to indicate the cost of the route so the best route among possible multiple routes to the same destination can be selected. A common use of the metric is to indicate the number of hops (routers crossed) to the network ID. Routing table entries can be used to store the following types of routes: Directly Attached Network IDs. Routes for network IDs that are directly attached. For directly attached networks, the Next Hop field can be blank or contain the IP address of the interface on that network. Remote Network IDs. Routes for network IDs that are not directly attached but are available across other routers. For remote networks, the Next Hop field is the IP address of a local router in between the forwarding node and the remote network. Host Routes. A route to a specific IP address. Host routes allow routing to occur on a per-IP address basis. For host routes, the network ID is the IP address of the specified host and the network mask is 255.255.255.255. Default Route. The default route is designed to be used when a more specific network ID or host route is not found. The default route network ID is 0.0.0.0 with the network mask of 

0.0.0.0. 


Q115. - (Topic 3) 

What is the default maximum number of equal-cost paths that can be placed into the routing table of a Cisco OSPF router? 

A. 2 

B. 8 

C. 16 

D. unlimited 

Answer:

Explanation: 

Maximum-paths (OSPF) 

To control the maximum number of parallel routes that Open Shortest Path First (OSPF) 

can support, use the maximum-paths command. 

Syntax Description 

maximum 

Maximum number of parallel routes that OSPF can install in a routing table. The range is from 1 to 16 routes. 

Command Default 

8 paths 


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Q116. - (Topic 4) 

Which of the following statements are TRUE regarding Cisco access lists? (Choose two.) 

A. In an inbound access list, packets are filtered as they enter an interface. 

B. In an inbound access list, packets are filtered before they exit an interface. 

C. Extended access lists are used to filter protocol-specific packets. 

D. You must specify a deny statement at the end of each access list to filter unwanted traffic. 

E. When a line is added to an existing access list, it is inserted at the beginning of the access list. 

Answer: A,C 

Explanation: 

In an inbound access list, packets are filtered as they enter an interface. Extended access lists are used to filter protocol specific packets. Access lists can be used in a variety of situations when the router needs to be given guidelines for decision-making. These situations include: Filtering traffic as it passes through the router To control access to the VTY lines (Telnet) To identify "interesting" traffic to invoke Demand Dial Routing (DDR) calls To filter and control routing updates from one router to another There are two types of access lists, standard and extended. Standard access lists are applied as close to the destination as possible (outbound), and can only base their filtering criteria on the source IP address. The number used while creating an access list specifies the type of access list created. The range used for standard access lists is 1 to 99 and 1300 to 1999. Extended access lists are applied as close to the source as possible (inbound), and can base their filtering criteria on the source or destination IP address, or on the specific protocol being used. The range used for extended access lists is 100 to 199 and 2000 to 2699. Other features of access lists include: Inbound access lists are processed before the packet is routed. Outbound access lists are processed after the packet has been routed to an exit interface. An "implicit deny" is at the bottom of every access list, which means that if a packet has not matched any preceding access list condition, it will be filtered (dropped). Access lists require at least one permit statement, or all packets will be filtered (dropped). One access list may be configured per direction for each Layer 3 protocol configured on an interface The option stating that in an inbound access list, packets are filtered before they exit an interface is incorrect. 

Packets are filtered as they exit an interface when using an outbound access list. The option stating that a deny statement must be specified at the end of each access list in order to filter unwanted traffic is incorrect. There is an implicit deny at the bottom of every access list. When a line is added to an existing access list, it is not inserted at the beginning of the access list. It is inserted at the end. This should be taken into consideration. For example, given the following access list, executing the command access-list 110 deny tcp 192.168.5.0 0.0.0.255 any eq www would have NO effect on the packets being filtered because it would be inserted at the end of the list, AFTER the line that allows all traffic. 

access-list 110 permit ip host 192.168.5.1 any access-list 110 deny icmp 192.168.5.0 0.0.0.255 any echo access-list 110 permit any any 


Q117. - (Topic 5) 

What is the subnet broadcast address of the LAN connected to Router1? 

A. 192.168.8.15 

B. 192.168.8.31 

C. 192.168.8.63 

D. 192.168.8.127 

Answer:

Explanation: 

The IP address assigned to FA0/1 is 192.168.8.9/29, making 192.168.8.15 the broadcast address. 


Q118. - (Topic 1) 

Refer to the exhibit. 

What kind of cable should be used to make each connection that is identified by the numbers shown? 

A. 1 - Ethernet Crossover cable 2 - Ethernet straight-through cable 3 - Fiber Optic cable 4 - Rollover cable 

B. 1 - Ethernet straight-through cable 2 - Ethernet straight-through cable 3 - Serial cable 4 - Rollover cable 

C. 1 - Ethernet rollover cable 2 - Ethernet crossover cable 3 - Serial cable 4 - Null-modem cable 

D. 1 - Ethernet straight-through cable 2 - Ethernet Crossover cable 3 - Serial cable 4 - Rollover cable 

E. 1 - Ethernet straight-through cable 2 - Ethernet Crossover cable 3 - Serial cable 4 - Ethernet Straight-through cable 

Answer:

Explanation: 

When connecting a PC to a switch, a standard Ethernet straight through cable should be used. This same cable should also be used for switch to router connections. Generally 

speaking, crossover cables are only needed when connecting two like devices (PC-PC, 

switch-switch, router-router, etc). 

Routers connect to frame relay and other WAN networks using serial cables. 

Rollover cables are special cables used for connecting to the console ports of Cisco 

devices. 


Q119. - (Topic 3) 

What command sequence will configure a router to run OSPF and add network 10.1.1.0 /24 to area 0? 

A. router ospf area 0 network 10.1.1.0 255.255.255.0 area 0 

B. router ospf network 10.1.1.0 0.0.0.255 

C. router ospf 1 network 10.1.1.0 0.0.0.255 area 0 

D. router ospf area 0 network 10.1.1.0 0.0.0.255 area 0 

E. router ospf network 10.1.1.0 255.255.255.0 area 0 F. router ospf 1 network 10.1.1.0 0.0.0.255 

Answer:

Explanation: 

Enabling OSPFSUMMARY STEPS 

1. 

enable 

2. 

configure terminal 

3. 

router ospf process-id 

4. 

network ip-address wildcard-mask area area-id 

5. 

end 

DETAILED STEPS 

Command or Action Purpose Step.1 enable 

Example: 

Device> enable Enables privileged EXEC mode. . Enter your password if prompted. 

Step.2 configure terminal 

Example: 

Device# configure terminal Enters global configuration mode. 

Step.3 router ospf process-id 

Example: 

Device(config)# router ospf 109 

Enables OSPF routing and enters router configuration mode. 

Step.4 network ip-address wildcard-mask area area-id 

Example: 

Device(config-router)# network 192.168.129.16 0.0.0.3 area 0 

Defines an interface on which OSPF runs and defines the area ID for that interface. 

Step.5 end 

Example: 

Device(config-router)# end 

Exits router configuration mode and returns to privileged EXEC mode. 

Reference: http://www.cisco.com/c/en/us/td/docs/ios-xml/ios/iproute_ospf/configuration/12-4t/iro-12-4t-book/iro-cfg.html#GUID-588D1301-F63C-4DAC-BF1C-C3735EB13673 


Q120. - (Topic 3) 

A router has learned three possible routes that could be used to reach a destination network. One route is from EIGRP and has a composite metric of 20514560. Another route is from OSPF with a metric of 782. The last is from RIPv2 and has a metric of 4. Which route or routes will the router install in the routing table? 

A. the OSPF route 

B. the EIGRP route 

C. the RIPv2 route 

D. all three routes 

E. the OSPF and RIPv2 routes 

Answer:

Explanation: 

When one route is advertised by more than one routing protocol, the router will choose to use the routing protocol which has lowest Administrative Distance. The Administrative Distances of popular routing protocols are listed below: