Monday, March 11, 2013

Random networking questions for you

Here are a few more ideas 
to get the grey matter ticking,
 all Cisco based questions, enjoy.




1. Which switching mode has the highest degree of error checking?

A) Fragment-Free
B) Fast-Forward
C) Cut-Through
D) Store-and-Forward
E) FIFO


2. Router(config)#access-list 150 deny tcp any host 172.32.14.2 eq 25

What type of ACL is this and what is it performing?

A) Standard ACL, deny all SMTP traffic to host 172.32.14.2
B) Standard ACL, deny all Telnet traffic to host 172.32.14.2
C) Extended ACL, deny all SMTP traffic to host 172.32.14.2
D) Extended ACL, deny all Telnet traffic to host 172.32.14.2
E) Named ACL, deny all SMTP traffic to host 172.32.14.2


3. Router(config-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


4. IP subnet-zero is enabled on all your routers.
How many bits must you borrow to create 16 subnets?


A) 1
B) 2
C) 3
D) 4
E) 5


5, What IP address will test the internal loopback of a node?

A) 127.0.0.1
B) 255.255.255.255
C) 0.0.0.0
D) 126.0.0.1
E) 127.0.0.0


6. The maximum default hop count for Routing Information Protocol (RIP) is?

A) 1
B) 10
C) 15
D) 16
E) 30






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1. Correct Answer: D

Store and forward switching method is known as store and forward because the switch will store the incoming data frame in its internal buffer, then when the complete frame has been received the switch will then run a Cyclic Redundancy Check (CRC) against the frame. If the CRC passes, the switch will then look up the destination MAC Address in its MAC filter table to forward it on to its destination.


2. Correct Answer: C

Router(config)#access-list 150 deny tcp any host 172.32.14.2 eq 25
Port 25 is SMTP. This extended ACL denies traffic from any source to host 172.32.14.2.


3. Correct Answer: E

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


4. Correct Answer: D

4 bit mask = 16 subnets

5. Correct Answer: A

127.0.0.1 is the loopback address in IP, it is a test mechanism for network adapters. Messages sent to 127.0.0.1 do not get delivered to the network. The NIC intercepts all loopback messages and returns them to the sending application.


6. Correct Answer: C

The maximum allowable hop count for RIP is 15 by default. 16 is unreachable.



How did you go? leave a comment if you found these helpful, thanks.

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