Saturday, September 17, 2016

Networking Questions 2016 Part 4

Been a while since we've stretched the grey matter, time to get to some more thinking with these random networking questions :-) Have fun.


1. In which layer of the OSI model does framing occur?

A) Layer 3
B) Physical layer
C) Application layer
D) Layer 2
E) Network layer


2. How would you view the current Cisco Configuration Register value?

A) show config-register
B) show reg
C) show config
D) show version


3. What does 'r' stand for in the capabilities of a Cisco device in the output of a show cdp neighbor command?

A) Repeater
B) Router
C) IGMP
D) Host
E) Switch


4. Ethernet technology relates to which type of network?

A) WAN
B) LAN
C) MAN
D) SAN
E) All of the above


5. What is the numerical value of the Bridge Priority held by Catalyst switches?

A) 32500
B) 32768
C) 100
D) 1024
E) 32700


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


7. PPP can be used over what types of serial connections?

A) Synchronous
B) Asynchronous
C) Both
D) Neither


8. 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





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1. Answer: D

The protocol data unit (PDU) of the Data Link layer (Layer 2) is the frame.  Data passed down from the Network layer is framed at layer 2 before being sent on to the Physical layer.

http://en.wikipedia.org/wiki/Data_Link_Layer


2. Answer: D

You can see the current value of the configuration register by using the show version command.
eg:
Configuration register is 0x2102


3. Answer: A

 Router#show cdp neighborsCapability Codes: R - Router, T - Trans Bridge, B - Source Route Bridge                  S - Switch, H - Host, I - IGMP, r - Repeater

 4. Answer: B

The IEEE standards relating to Ethernet technology were originally developed for local area networks.
This is the Cisco definition, although in practice this definition is very blurred :-).

 5. Answer: B

The Bridge Priority is the numerical value held by switches. All Catalyst switches have a default priority of 32768. To determine the root bridge you combine the priority of each bridge with its MAC. If two switches have the same priority value the lowest MAC address becomes the root bridge.

6. 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.

http://en.wikipedia.org/wiki/Application_Layer


7. Answer: C 

Point-to-Point Protocol (PPP) can be used over ISDN (synchronous) and dial-up (asynchronous) connections.


8. 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.



How did you go??
I told you they would be random, more coming, stay tuned.