Cisco 100-105 Certification Exam Questions

Upon getting the 100-105 CCNA Routing and Switching certification, your skills about Interconnecting Cisco networking devices are validated.

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Question No. 1

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

Answer: B

209.165.201.23 to 209.165.201.30 provides for 8 addresses.

Topic 5, Infrastructure Maintenance

Question No. 2

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.)

Answer: C, D

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.

Question No. 3

Instructions

Which two of the following are true regarding the configuration of RouterA? (Choose two.)

Answer: A, C

Question No. 4

Which statement describes the effect of the overload keyword in the ip nat inside source list 90 interface ethernet 0/0 overload command?

Answer: D

Question No. 5

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

Answer: D

IP Routing Table Entry Types

An 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.

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