Showing posts with label hobby. Show all posts
Showing posts with label hobby. Show all posts

Saturday, June 1, 2013

Networking Questions - Cisco based

Another interesting set of Questions to help you on your way to certification - or as a refresh - enjoy.

1. How many access control lists can you apply to an interface?

A) Unlimited
B) One ACL per port per direction
C) 10
D) You do not apply ACL to interfaces


2.  IGRP advertises routes to interior, system and exterior routes

A) True
B) False


3. What class of routing protocol is EIGRP?

A) Link state
B) Distance vector
C) Hybrid


4. Where would you place standard access lists?

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


5. With full-duplex Ethernet no collisions can occur.

A) True
B) False








1. Correct Answer: B
Cisco routers only allow you to place one access control list (ACL) per direction. One inbound ACL and one outbound ACL. However you can add multiple statements to these access lists.


2. Correct Answer: A
IGRP advertises three types of routes:

Interior routes are routes between subnets in the network attached to a router interface.
System routes are routes to networks within an autonomous system.
Exterior routes are routes to networks outside the autonomous system. 


3.  Correct Answer: C
EIGRP is a hybrid routing protocol which uses a combination of distance vector and link state methods to determine the best path.


4. Correct Answer: A
Standard access lists only filter based on source address so they have to be placed as close to the destination as possible.

5. Correct Answer: A


How did you go? More Questions coming, stay tuned...




Monday, February 18, 2013

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.

Friday, June 29, 2012

CCNA Example Questions Part 1


And now for something different.  Below are 5 random questions that are typically found in Cisco CCNA (Cisco Certified Network Associate) accreditation exams.  Answers at the bottom of the post.



1. What is port 53 used for?

A.) FTP data
B.) FTP program
C.) Telnet
D.) DNS
E.) TFTP

2. What layer of the OSI Reference Model sends and receives bits and specifies the electrical, mechanical, procedural and functional requirements for maintaining a physical link between end systems?

A.) Session
B.) Transport
C.) Network
D.) Data Link
E.) Physical

3. Each port on a switch is a separate broadcast domain?

A.) True
B.) False

4, 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

5. What is the length of the MAC address in bits?

A.) 32 bits
B.) 48 bits
C.) 12 bits
D.) 80 bits

1 minutes explanation of IP address and subnet mask




=================================================================


1. Answer D  DNS uses port 53
2. Answer E  Physical layer
3. Answer B  Switches form individual collision domains but a single broadcast domain
4. Answer B  An access list has an explicit deny all statement at the bottom, to prevent this the general catch all statement access-list 1 permit any  is used at the end of the list.
5. Answer B A MAC address is 48 bits represented as 12 Hexadecimal characters.

How did you go? More questions will be published at random :-) 



Saturday, October 23, 2010

The Roots Of Radio Hobbyists



Radio hobbyists can play with their equipment all day without giving a thought to the origins of their hobby. Early radio hobbyists were part of something that was, at the time, new and fairly crazy.

After radio technology was stabilized, there was a steady growth of radio signaling in the fields of navigation of ships and for rescue operations. On the other hand, the amateur radio operators also started to dominate the air. The first documented and famous amateur wireless enthusiast was a then young man named Irving Vermilya born in 1890 when wireless transmission was being born. The young man since age 12 heard Marconi and built his own wireless transmission equipment and was often "heard" telegraphing with ships during that time. In 1911 he became a member of the Radio Club that had been formed. He got himself certified in 1912 when law mandated all wireless operators to be certified. In his own words,


This was pre-audio era, and communication was purely in Morse code. Irving then organized his own amateur group who had regular meetings monthly and would communicate daily wishing "GM" (good morning) and "GN" (good night), some of the first amateur jargon to be used. He also proceeds to describe in his series of articles published in QST magazine in 1917 as to how they managed to lay the telegraph lines and such and how they "drew juice" for the wireless operation from the electric lines instead of relying on batteries.

Meanwhile, apart from the "professionals" and "amateurs", with audio wireless signal transmission there was a new revolution setting in. A Dutch engineer in Hague was the first to make regular wireless transmission via radio. This could be considered the first regular radio broadcast. After this there was slow development until the commercial radio stations came into being.

The requirement to be certified killed the enthusiasm in many amateurs, and the number of amateurs dwindled. But then after WWI, there was a boom. The first radio clubs were formed in 1909 and this was the beginning of the radio hobbies which included radio as a part of the hobby activity.

During the WWI the amateur radio operators were asked to stop their activity and dismantle the equipment. Radio operators in uniform helped in military communications. They got back on the air again by November 1919 again. A similar lull in amateur radio happened during Second World War and got back on air by 1946. After lots of battles over the frequency range that the amateurs can tune into, the amateur radio is here to stay!

At present there are more than 170,000 ham operators which is possibly not the complete picture. It is still increasing. So, with Irving Vermilya was born the amateur radio operation, since he was the first radio hobbyist. After lots of developments, including the discovery of the transistor which greatly decreased the size of the radio equipment, the old ways still remains which included "waiting for someone to signal".

The rules to get oneself certified and licensed included a Morse code proficiency until the World Radiocommunication Conference in Geneva in 2003 that eliminated the need for Morse code proficiency from the licensure tests. Taking effect from February 23, 2007 the Morse code has been eliminated from the tests for amateur radio license tests.


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