Monday, April 8, 2013

More Random Networking Questions

Here's another set of Cisco based 
networking questions, 
They may assist with your gaining certification 
or just as a refresher - enjoy!

1. Which of the following could be a valid MAC address?

A) 00-08-74-CE-B7-90
B) 192.168.0.1
C) FFFF.FFFF.FFFF.FFFF
D) 255.255.255.240


2. Fragment Free switching method is best described by which of the following?

A) The entire frame is received before forwarding is commenced
B) Forwards frame after receiving the destination MAC address
C) Filters out collision packets by waiting for the first 64 bytes of data


3. A CIDR value of /30 equates to what subnet mask?

A) 255.255.255.253
B) 255.255.255.128
C) 255.255.255.248
D) 255.255.255.252


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

A) True
B) False


5. 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


6. What OSI layer does the following refer to?

"Establishes availability of intended communication partners, establishes agreement on procedures regarding error recovery and data integrity and synchronizes networked applications"


A) Transport layer
B) Session layer
C) Datalink layer
D) Application layer
E) Presentation layer




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1. Correct Answer: A

The standard format for printing MAC addresses is six groups of two hexadecimal digits, separated by hyphens (-) or colons (:) e.g. 00-08-74-CE-B7-90, 00:08:74:CE:B7:90.
Another convention commonly used is three groups of four hexadecimal digits separated by dots e.g. 0573.4567.19ab.


2. Correct Answer: C

Fragment Free is also referred to as Modified Cut-Through. It is the default mode used by Cisco® Catalyst® 1900 series switches. This switching method is the same as with Cut-Through except the switch will check the first 64 bytes of every frame received as this is where the vast majority of errors occur within a frame.

3. Correct Answer: D

4. 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.


5. 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.


6. Correct Answer: D

The Application layer of the OSI model (layer 7) establishes availability of intended communication partners, establishes agreement on procedures regarding error recovery and data integrity and synchronizes networked applications.




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