Networking questions part 3

These questions are based on Cisco CCNA network exam, and I believe are also a good refresher to keep the mind active.  If you don't use it, you'll lose it as they say :-).



 
1. The Transport layer is...

A) Connectionless
B) Connection-oriented
C) Both

2. HDLC is ISO standard WAN protocol which means you don't need Cisco routers at both ends of a WAN connection, a router from any vendor that supports HDLC will work.

A) True
B) False

3. If your switch uses shared memory buffering, what would happen if a packet could not be delivered because of a busy destination port?

A) It would delay transmission of all packets in memory
B) It would be sent to the destination port anyway
C) It would wait in a queue while all other packets in memory are transmitted
D) It would drop the packet after an allocated time

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

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

5. When STP is converging no data can move through the switched network.

A) True
B) False





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1. Correct Answer: C

2. Correct Answer: B

Explanation: Even though HDLC is an ISO standard, each vendor has their own version of HDLC.

3. Correct Answer: C

Explanation: The area of memory where the switch stores the data is called the memory buffer.

The memory buffer can use two methods for forwarding frames:

• port-based memory buffering - In port-based memory buffering frames are stored in queues that are linked to specific incoming ports.
• shared memory buffering - Shared memory buffering deposits all frames into a common memory buffer which all the ports on the switch share.

4. Correct Answer: D

Explanation: Cut-Through switching is also referred to by Cisco 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. Correct Answer: A

How did you go?

More Networking Questions

Five more questions to get the brain thinking again for networking. A mix of all sorts with the answers below - no cheating :-).

 1. What is required for VTP to communicate VLAN information between switches?

A) VTP domain must be identical on all switches
B) One switch needs to be a VTP server
C) A router is required
D) Both A and B are correct
E) None of the above

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

A) 32500
B) 32768
C) 100
D) 1024
E) 32700
3. 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

 4. What IOS command would you issue in privileged-mode to change the router configuration stored on TFTP?

A) config t
B) config mem
C) config net
D) config tftp
5. Where would you place more specific tests in your access list?

A) At the top
B) At the bottom
C) Placement doesn't matter

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1. Correct Answer: D

Explanation: VTP requires the following to communicate VLAN information between switches.  The VTP domain must be identical on all switches and one switch needs to be a VTP server.

2. Correct Answer: B

Explanation: 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.

3. Correct Answer: B

Explanation: 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.

4. Correct Answer: C

Explanation: To change the router configuration stored on TFTP you use configure network (config net)

5. Correct Answer: A

Explanation: Always organise your access lists so the more specific tests are at the top.

How did you go? More to come next week.

Networking questions - CCNA based

Another year and time to publish five more questions to get the neurons clicking again for networking, see how you go. A mix of all sorts with the answers below - no cheating :-).

1, What is the hard-coded address found on a network interface card called?


A) IP address
B) NIC address
C) MAC address
D) LAN address

2. TCP and UDP protocols are associated with the Transport layer of the TCP/IP model, which is sometimes referred to as the "host-to-host transport layer".

A) FTP data
B) FTP program
C) Telnet
D) SMTP
E) TFTP

3. What TCP/IP layer are TCP and UDP protocols associated with?

A) Application
B) Host-to-Host
C) Internet
D) Network Access

4. 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

5. What is required for VTP to communicate VLAN information between switches?

A) VTP domain must be identical on all switches
B) One switch needs to be a VTP server
C) A router is required
D) Both A and B are correct
E) None of the above

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1. Correct Answer: C

2. Correct Answer: B

Explanation:  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.

3. Correct Answer: B

4. Correct Answer: A

Explanation: 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.

5. Correct Answer: D

Explanation: VTP requires the following to communicate VLAN information between switches.  The VTP domain must be identical on all switches and one switch needs to be a VTP server.

Mobile messaging formats summary

Anyone interested in mobile advertising needs to be familiar with the following terms:

Mobile Web, Wireless Internet

A channel for delivery of web content that offers and formats content according to the mobile context. Mobile context is characterized by the nature of user information needs (updating blog, searching for restaurant), basic mobile phone characteristics (screen size, keypad input), and special capabilities (connection type, location).

Multimedia Messaging Service (MMS)

Standard for messaging systems that enable sending messages that include multimedia objects (images, audio, video, rich text). May or may not include normal text.

Short Message Service (SMS)

A standard for telephony messaging systems that allows sending messages between mobile devices that consist of text-only content in a short (up to 160 characters) message (SMS, TXT).

WAP (Wireless Application Protocol)

Wireless Application Protocol. An open international standard for the presentation and delivery of wireless information and telephony services on mobile devices.

WAP 2.0

Format of choice for mobile web. Allows mobile carriers, content providers and media companies to present content and functionality in more robust formats via faster wireless technologies (as compared to WAP 1.0) and is more in line with Internet standards.

WAP Pull

User directly requests a mobile WAP site by entering a URL or by entering the phone number on a content provider web page.

WAP Push

A specifically encoded message that includes a link to a WAP address allowing WAP content to be pushed to the handset

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Star fleet engineering

Gives you a headache doesn't it, maybe IKEA can get some tips :-)

I failed a Health and Safety course at the office yesterday. 

One of the questions was: "In the event of a fire, what steps would you take?" 

"F*%king' big ones" was apparently the wrong answer.