Question 1

Which of the following is the valid host range for the subnet on which the IP address 192.168.168.188 255.255.255.192 resides?

Accepted Answer

256 - 192 = 64. 64 + 64 = 128. 128 + 64 = 192. The subnet is 128, the broadcast address is 191, and the valid host range is the numbers in between, or 129-190.

Question 2

Which protocol is used to send a destination network unknown message back to originating hosts?

Accepted Answer

ICMP is the protocol at the Network layer that is used to send messages back to an originating router.

Question 3

What does the passive command provide to dynamic routing protocols?

Accepted Answer

The passive command, short for passive-interface, stops regular updates from being sent out an interface. However, the interface can still receive updates.

Question 4

Which protocol does DHCP use at the Transport layer?

Accepted Answer

User Datagram Protocol is a connection network service at the Transport layer, and DHCP uses this connectionless service.

Question 5

Which router command allows you to view the entire contents of all access lists?

Accepted Answer

To see the contents of all access lists, use the show access-lists command.

Question 6

Which command is used to determine if an IP access list is enabled on a particular interface?

Accepted Answer

The show ip interface command will show you if any outbound or inbound interfaces have an access list set.

Question 7

How many broadcast domains are created when you segment a network with a 12-port switch?

Accepted Answer

By default, switches break up collision domains but are one large broadcast domain.

Question 8

Which command is used to upgrade an IOS on a Cisco router?

Accepted Answer

The copy tftp flash command places a new file in flash memory, which is the default location for the Cisco IOS in Cisco routers.

Question 9

If you wanted to delete the configuration stored in NVRAM, what would you type?

Accepted Answer

The command erase startup-config deletes the configuration stored in NVRAM.

Question 10

What does the command routerA(config)#line cons 0 allow you to perform next?

Accepted Answer

The command line console 0 places you at a prompt where you can then set your console user-mode password.

Question 11

To back up an IOS, what command will you use?

Accepted Answer

The command copy flash tftp will prompt you to back up an existing IOS in flash to a TFTP host.

Question 12

Which WLAN IEEE specification allows up to 54Mbps at 2.4GHz?

Accepted Answer

IEEE 802.11B is 2.4GHz, but with a maximum of only 11Mbps. IEEE 802.11G is in the 2.4GHz range, with a top speed of 54Mbps.

Question 13

What flavor of Network Address Translation can be used to have one IP address allow many users to connect to the global Internet?

Accepted Answer

Port Address Translation (PAT) allows a one-to-many approach to network address translation.

Networking Basics Questions