Thursday, February 20, 2014

A new series of Cisco base networking questions for 2014 - part1

Here are a number of random questions based on the Cisco certifications, but they relate to IT and networking in general as well. See how you go and check last years series for more!
(Some of these are a little tricky, just like the cert exams :-)

Action may not always bring happiness...
but there is no happiness without action.

By: Benjamin Disraeli

1. What is true about the MAC address?

A) Used to identify networks
B) Defined at the Network layer
C) Unique for every networked device in the world
D) Identical to the IP address

2. Bridges cannot provide congestive feedback information to end nodes?

A) True
B) False

3. What do asymmetric switches require?

A) memory buffers
B) extra ports
C) statically assigned ports only
D) high speed CAM

4. The Cisco Spanning Tree protocol is compatible with IEEE 802.1d?

A) True
B) False
5. What is the administrative distance of EIGRP?

A) 110
B) 1
C) 120
D) 90
E) 100

6. What IOS command would disable CDP on a routers interface?

A) no cdp enable
B) disable cdp
C) no cdp
D) no cdp run

7. Bridges forward layer 2 broadcasts, but switches don't.

A) True
B) False
8. Router>     What mode are you in when you see this prompt?

A) user exec mode
B) privileged mode
C) global configuration mode
D) interface configuration mode
E) routing protocol configuration

9. What layer of the OSI model is responsible for multiplexing upper-layer applications, establishing sessions and tearing down virtual circuits?

A) Presentation
B) Session
C) Transport
D) Network
E) Data Link

10. What is port 53 used for?

A) FTP data
B) FTP program
C) Telnet

My Dear Diary

Answers to the above questions..

1. Correct Answer: C

MAC addresses are assigned by the manufacturer of a network interface card (NIC) and are stored in its hardware. A MAC address contains the manufacturer's identification number.
The MAC address may also be referred to as the burned-in address, hardware address, Ethernet address or physical address and is part of the Data Link layer, specifically the Media Access Control sub-layer of the Data Link layer.

2. Correct Answer: A

Flow Control and Congestive Feedback are functions of the Network layer. Bridges operate at the Data Link layer so these responsibilities fall to the end devices in a bridged environment.

3. Correct Answer: A

With ability for support of high bandwidth ports Asymmetric Switches require more Buffer memory for storing & forwarding of packets for fast processing.

4. Correct Answer: B

The original Spanning-Tree protocol was created by Digital Equipment Corporation (DEC) which is now part of Compaq. The IEEE created its own version called IEEE 802.1d which is not compatible with the original version. Cisco enhanced the original 802.1d specification with features such as Uplink Fast, Backbone Fast, and Port Fast to speed up the convergence time of a bridged network. However these new features are proprietary, and can only be configured on Cisco switches.

5. Correct Answer: D

Administrative distance is used by Cisco routers to select the best path when there are two or more different routes to the same destination from two different routing protocols. Administrative distance defines the reliability of a routing protocol. EIGRP has an administrative distance of 90.

6. Correct Answer: A

You can disable CDP on an interface which supports CDP with the no cdp enable command.

7. Correct Answer: B

Both switches and bridges forward layer 2 broadcasts.

8. Correct Answer: A

Here is a summary of Cisco IOS router command prompts:

Router> - User EXEC mode
Router# - Privileged EXEC mode
Router(config)# - Global configuration mode
Router(config-if)# - Interface level configuration mode
Router(config-router)# - Routing engine level within configuration mode
Router(config-line)# - Line level (vty, tty, async) within configuration mode

9. Correct Answer: C

The Transport layer is responsible for multiplexing upper-layer applications (ports), establishing sessions and tearing down virtual circuits.

10. Correct Answer: D

DNS uses commonly known port 53

Stay tuned for more questions ...

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