Tuesday, September 1, 2015

Random Cisco based networking questions - CCNA - Part 8

Here are another set of Random networking questions to ponder, good start for September :-)

I saw Bloke with a bumper sticker saying: "I am a veterinary surgeon, therefore I drive like an animal." Suddenly I realised how many gynecologists and proctologists there are on the roads.:-)

1. What is Cisco's default NAT table entry timeout (translation timeout)?

A: 1 hour
B: 12 hours
C: 24 hours
D: 36 hours
E: 48 hours

2. 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

3. What is port 20 used for?

A: FTP data
B: FTP program
C: Telnet

4. Extended ACL allow you to filter Application layer traffic.

A: True
B: False

5. What command would you use to erase the startup config of a router?

A: erase nvram
B: erase flash
C: delete startup
D: erase startup
E: delete run

6. What is the reserved address space for a Class B network?

A) -
B) -
C) -
D) -
E) -

7. What is responsible for ensuring a router is functional and the interfaces are present on booting?

A) Bootstrap
C) ROM monitor
E) Configuration register

8. Store and forward 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 destination address
C) Filters out collision packets by waiting for the first 64 bytes of data


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1. Answer: C

When an entry is placed into the NAT table a timer begins, the duration of this timer is called the translation timeout, defaulted to 24 hours on Cisco routers.

2. Answer: C


3. Answer: A

File Transfer Protocol (FTP) is a network protocol used to copy files from one host to another over a TCP/IP-based network.
A client makes a TCP connection to the server's port 21. This connection remains open for the duration of the session called the control connection, with a second connection, called the data connection, opened by the server from its port 20 to a client port required to transfer file data.

4. Answer: A

To filter Application layer traffic using extended ACLs, first specify TCP, then the port number of the Application layer protocol.

5. Answer: D

To erase the startup configuration use the following command:

Router#erase startup-config
Router#erase startup

6. Answer: C 


7.  Answer: B

POST (Power-on-self-test) stored in ROM performs a basic router health-check on booting.

8. Answer: A

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.

How did you go?  stay tuned for more coming soon :-)