29 + Interview Questions in Networking Basics in Networking Page 1 InterviewSolution

1.	How long is an IPv6 address?
Answer» An IPv6 address is 128 bits long.

Discussion

2.	What flavor of Network Address Translation can be used to have one IP address allow many users to connect to the global Internet?
Answer» Port Address Translation (PAT) allows a one-to-many approach to network address translation.

Discussion

3.	What are the two main types of access control lists (ACLs)?
Answer» Standard and extended access control lists (ACLs) are used to configure security on a router.

Discussion

4.	What protocols are used to configure trunking on a switch?
Answer» VTP is not right because it has nothing to do with trunking except that it sends VLAN information across a trunk link. 802.1Q and ISL are used to configure trunking on a port.

Discussion

5.	Which protocol does DHCP use at the Transport layer?
Answer» User Datagram Protocol is a connection network service at the Transport layer, and DHCP uses this connectionless service.

Discussion

6.	Which command is used to determine if an IP access list is enabled on a particular interface?
Answer» The show ip interface command will show you if any outbound or inbound interfaces have an access list set.

Discussion

7.	Where is a hub specified in the OSI model?
Answer» Hubs regenerate electrical signals, which are specified at the Physical layer.

Discussion

8.	What does the command provide to dynamic routing protocols?
Answer» The passive command, short for passive-interface, stops regular updates from being sent out an interface. However, the interface can still receive updates.

Discussion

9.	What command will display the line, protocol, DLCI, and LMI information of an interface?
Answer» The show interface command shows the line, protocol, DLCI, and LMI information of an interface.

Discussion

10.	Which protocol does Ping use?
Answer» ICMP is the protocol at the Network layer that is used to send echo requests and replies.

Discussion

11.	What does a VLAN do?
Answer» VLANs break up broadcast domains at layer 2.

Discussion

12.	What is the main reason the OSI model was created?
Answer» The primary reason the OSI model was created was so that different networks could inter-operate.

Discussion

13.	If you wanted to delete the configuration stored in NVRAM, what would you type?
Answer» The command erase startup-config deletes the configuration stored in NVRAM.

Discussion

14.	To back up an IOS, what command will you use?
Answer» The command copy flash tftp will prompt you to back up an existing IOS in flash to a TFTP host.

Discussion

15.	What protocol does PPP use to identify the Network layer protocol?
Answer» Network Control Protocol is used to help identify the Network layer protocol used in the packet.

Discussion

16.	How many broadcast domains are created when you segment a network with a 12-port switch?
Answer» By default, switches break up collision domains but are one large broadcast domain.

Discussion

17.	What does the command allow you to perform next?
Answer» The command line console 0 places you at a prompt where you can then set your console user-mode password.

Discussion

18.	Which router command allows you to view the entire contents of all access lists?
Answer» To see the contents of all access lists, use the show access-lists command.

Discussion

19.	Which class of IP address has the most host addresses available by default?
Answer» Class A addressing provides 24 bits for host addressing.

Discussion

20.	How often are BPDUs sent from a layer 2 device?
Answer» Every 2 seconds, BPDUs are sent out from all active bridge ports by default.

Discussion

21.	What is a stub network?
Answer» Stub networks have only one connection to an internetwork. Only default routes can be set on a stub network or network loops may occur.

Discussion

22.	In a network with dozens of switches, how many root bridges would you have?
Answer» You should have only one root bridge per network.

Discussion

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

Discussion

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

Discussion

25.	What PPP protocol provides dynamic addressing, authentication, and multilink?
Answer» Link Control Protocol in the PPP stack provides dynamic addressing, authentication, and multilink.

Discussion

26.	How many collision domains are created when you segment a network with a 12-port switch?
Answer» Layer 2 switching creates individual collision domains.

Discussion

27.	Which protocol is used to send a destination network unknown message back to originating hosts?
Answer» ICMP is the protocol at the Network layer that is used to send messages back to an originating router.

Discussion

28.	What command is used to create a backup configuration?
Answer» The command to back up the configuration on a router is copy running-config startup-config.

Discussion

29.	You have 10 users plugged into a hub running 10Mbps half-duplex. There is a server connected to the switch running 10Mbps half-duplex as well. How much bandwidth does each host have to the server?
Answer» Each device has 10 Mbps to the server.

Discussion

Explore topic-wise InterviewSolutions in .

How long is an IPv6 address?

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

What are the two main types of access control lists (ACLs)?

What protocols are used to configure trunking on a switch?

Which protocol does DHCP use at the Transport layer?

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

Where is a hub specified in the OSI model?

What does the command provide to dynamic routing protocols?

What command will display the line, protocol, DLCI, and LMI information of an interface?

Which protocol does Ping use?

What does a VLAN do?

What is the main reason the OSI model was created?

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

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

What protocol does PPP use to identify the Network layer protocol?

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

What does the command allow you to perform next?

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

Which class of IP address has the most host addresses available by default?

How often are BPDUs sent from a layer 2 device?

What is a stub network?

In a network with dozens of switches, how many root bridges would you have?

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

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

What PPP protocol provides dynamic addressing, authentication, and multilink?

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

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

What command is used to create a backup configuration?

You have 10 users plugged into a hub running 10Mbps half-duplex. There is a server connected to the switch running 10Mbps half-duplex as well. How much bandwidth does each host have to the server?