Monday, March 16, 2015

Random Cisco based networking questions - CCNA - Part 3

Welcome to part 3 of the random networking questions (Cisco based) series.

Ready to get the brain tickin? Lets go!

1. What Cisco IOS enhanced editing command end the configuration mode and returns to EXEC?

A) Ctrl+Z
B) Ctrl+W
C) Ctrl+F
D) Esc+F
E) Tab

2, Which devices operate at the Data Link layer?

A) Switch
B) Bridge
C) Repeater
D) Router
E) Both A and B

3. Triggered updates are used to speed the convergence process?

A) True
B) False

4. Which switching mode is the most likely to forward frames containing errors?

B) Modified Cut-Through
C) Store-and-Forward
D) Cut-Through
E) Fragment-Free

5. What is the function of asymmetric switching?

A) To prioritise bandwidth to nodes that need it
B) To prevent bottlenecks on the port a server is connected to
C) To allow RAS clients to connect to the network

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

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

amaysim - One pure SIM

1. Answer A

Keyboard Shortcut Actions (I've published this before but thought it worthy to remind :-)

Up Arrow Displays your previous commands.  (command history)
TAB Key Completes a partially typed CLI commands.
CTRL+Z Takes you back to Privileged EXEC Mode.

CTRL+A Places the cursor at the beginning of a line.
CTRL+E Places the cursor at the end of a line.
CTRL+R Redisplays the current command line.
CTRL+W Erases a word (behind the cursor).
CTRL+U Erases an entire line.

2. Answer E

Bridges and switches filter network traffic based on the MAC address (hardware address) and are Data Link layer devices.

A Repeater does not apply any filtering and is therefore a Physical Layer device.

Routers forward packets based on logical network addresses are are Network Layer devices.

3. Answer A

A triggered update is sent immediately in response to a change in the network (e.g. A link going down). The router detecting the change immediately sends an update message to its adjacent routers, which then generate their own triggered updates. This process continues until the network converges. Triggered updates occurs independently from the regular routing updates and are intended to speed the convergence process.

4. Answer D

Cut-Through switching is also referred to as Fast Forward.

When in cut-through mode the switch waits for the destination MAC Address to be received. Once the MAC Address is known the switch refers to its MAC filter table to determine which port the frame should be forwarded out. The switch forwards the frame even before the entire frame has arrived.

Frames with and without errors are forwarded in cut-through switching, leaving the error detection of the frame to the intended recipient.

5. Answer B

An asymmetric switch provides switched connections between ports of different bandwidths.
Asymmetric switching is optimized for client-server traffic where multiple clients simultaneously communicate with a server, requiring more bandwidth dedicated to the server port to prevent a bottleneck at that port.

6. Answer C

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

All over the place that time - stay tuned for the next batch - coming soon:-)

  “Employ your time in improving yourself by other men's writings, so that you shall gain easily what others have labored hard for.”