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Q121. - (Topic 3)

If an Ethernet port on a router was assigned an IP address of 172.16.112.1/20, what is the maximum number of hosts allowed on this subnet?

A. 1024

B. 2046

C. 4094

D. 4096

E. 8190

Explanation:

Each octet represents eight bits. The bits, in turn, represent (from left to right): 128, 64, 32 , 16 , 8, 4, 2, 1 Add them up and you get 255. Add one for the all zeros option, and the total is 256. Now, take away one of these for the network address (all zeros) and another for the broadcast address (all ones). Each octet represents 254 possible hosts. Or 254 possible networks. Unless you have subnet zero set on your network gear, in which case you could conceivably have 255. The CIDR addressing format (/20) tells us that 20 bits are used for the network portion, so the maximum number of networks are 2^20 minus one if you have subnet zero enabled, or minus 2 if not. You asked about the number of hosts. That will be 32 minus the number of network bits, minus two. So calculate it as (2^(32-20))-2, or (2^12)-2 = 4094

Q122. - (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

Explanation:

209.165.201.23 to 209.165.201.30 provides for 8 addresses.

Q123. - (Topic 7)

Refer to the exhibit.

Which statement describes the effect of this configuration?

A. The VLAN 10 VTP configuration is displayed.

B. VLAN 10 spanning-tree output is displayed.

C. The VLAN 10 configuration is saved when the router exits VLAN configuration mode.

D. VLAN 10 is added to the VLAN database.

Q124. - (Topic 5)

Refer to the exhibit.

A user cannot reach any web sites on the Internet, but others in the department are not

having a problem.

What is the most likely cause of the problem?

A. IP routing is not enabled.

B. The default gateway is not in the same subnet.

C. A DNS server address is not reachable by the PC.

D. A DHCP server address is not reachable by the PC.

E. NAT has not been configured on the router that connects to the Internet.

Explanation:

Answer C is only answer that makes sense. IP routing does not need to be enabled on PC’s, this is a router function. We can see from the output that the PC and default gateway are on the same subnet. DHCP has not been enabled on this PC so it has been configured with a static address so reaching the DHCP server is not the issue. Finally, NAT must be configured correctly or the other users in the department would also be having issues.

Q125. - (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

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.

Q126. - (Topic 1)

Which two characteristics describe the access layer of the hierarchical network design model? (Choose two.)

A. layer 3 support

B. port security

C. redundant components

D. VLANs

E. PoE

Explanation:

Access layer The main purpose of the access layer is to provide direct connection to devices on the network and controlling which devices are allowed to communicate over it. The access layer interfaces with end devices, such as PCs, printers, and IP phones, to provide access to the rest of the network. The access layer can include routers, switches, bridges, hubs, and wireless access points (AP).

Switch features in the Access layer:

......

Port security

VLANs

Fast Ethernet/Gigabit Ethernet

Power over Ethernet (PoE)

Quality of Service (QoS)

References: http://www.ciscopath.com/content/61/ http://www.mcmcse.com/cisco/guides/hierarchical_model.shtml

Topic 2, LAN Switching Technologies

Q127. - (Topic 5)

A receiving host has failed to receive all of the segments that it should acknowledge. What can the host do to improve the reliability of this communication session?

A. decrease the window size

B. use a different source port for the session

C. decrease the sequence number

D. obtain a new IP address from the DHCP server

E. start a new session using UDP

The Window bit in the header determines the number of segments that can be sent at a time. This is done to avoid overwhelming the destination. At the start of the session the window in small but it increases over time. The destination host can also decrease the window to slow down the flow. Hence the window is called the sliding window. When the source has sent the number of segments allowed by the window, it cannot send any further segments till an acknowledgement is received from the destination. On networks with high error rates or issues, decreasing the window size can result in more reliable transmission, as the receiver will need to acknowledge fewer segments. With a large window size, the sender will need to resend all the frames if a single one is not received by the receiver.

Q128. - (Topic 3)

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

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.

Q129. - (Topic 1)

Refer to the exhibit.

As packets travel from Mary to Robert, which three devices will use the destination MAC address of the packet to determine a forwarding path? (Choose three.)

A. Hub1

B. Switch1

C. Router1

D. Switch2

E. Router2

F. Switch3

Explanation:

Q130. - (Topic 5)

Refer to the exhibit.

An administrator cannot connect from R1 to R2. To troubleshoot this problem, the administrator has entered the command shown in the exhibit. Based on the output shown, what could be the problem?

A. The serial interface is configured for half duplex.

B. The serial interface does not have a cable attached.

C. The serial interface has the wrong type of cable attached.

D. The serial interface is configured for the wrong frame size.

E. The serial interface has a full buffer.

Explanation: