Wednesday, March 4, 2015

Random Cisco based networking questions - CCNA - Part 1

The first half a dozen of random networking questions to get you thinking in 2015 :-)

Enjoy,,

1. Where would you place extended access lists?

A) As close to the destination as possible
B) As close to the source as possible


2. Bridges can only have one spanning tree instance, while switches can have many.

A) True
B) False


3. What would happen if you put the following ACL on an interface?

access-list 1 deny 172.168.0.1
access-list 1 deny 192.5.2.1


A) All traffic from 172.168.0.1 and 192.5.2.1 would be denied
B) All traffic would be denied
C) Nothing
D) These are not Cisco IOS ACL commands


4. Which layer of the OSI model is concerned with Media Access Control addresses?

A) Layer 1
B) Datalink layer
C) Application Layer
D) Session Layer
E) Transport Layer


5. What do the IOS commands below achieve?

Router(config)#access-list 5 permit 172.5.15.2
Router(config)#line vty 0 4
Router(config-line)#access-class 5 in


A) Create an extended ACL to only permit host 172.5.15.2 to connect to VTY
B) Create a standard ACL to only permit host 172.5.15.2 to connect to VTY
C) Create an extended ACL to only permit hosts on the network 172.5.15.2 to connect to VTY
D) Create a standard ACL to only permit hosts on the network 172.5.15.2 to connect to VTY

6. What is the Spanning Tree forward delay?

A) The time that is spent in the Listening and Learning states
B) 50 seconds
C) Time taken for a switch to go from Listening to Forwarding
D) Time taken for a switch to go from Blocking to Forwarding






amaysim - One pure SIM




1. Answer B 

Extended access lists are much more granular than standard ACLs, you can block specific ports or protocols.

To avoid unnecessary traffic on your network place them as close to the source as possible.


2. Answer A (true)

Bridges are software based and can only have one spanning-tree instance per bridge, while switches are hardware based and can have many.


3. Answer B

People forget the not shown the automatic deny any any on the tail end of any access list :-)

4. Answer B

Media Access Control is a sublayer of the Data Link Layer specified within the OSI model. It provides addressing and channel access control.  The hardware that implements the MAC is referred to as a Media Access Controller.

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


5. Answer B

Router(config)#access-list 5 permit 172.5.15.2
Router(config)#line vty 0 4
Router(config-line)#access-class 5 in


This standard access list permits only the host 172.5.15.2 to connect to your VTY telnet line.


6. Answer A 

Forward delay — The time that is spent in the listening and learning state, 15 sec by default, but you can tune the time to be between 4 and 30 sec.



How did you do?? stay tuned more coming or check out the previous posts :-)


"If you want success, then don't rely on other people to do what YOU can do!" 
Sasha Azevedo