Computer Network Security

The maximum frame size wireless device can transmit without fragmenting the frame.

A collision happens when two devices that use the same medium transmit packets at exactly the same time. The two packets can corrupt each other, and the result is a group of unreadable pieces of data. If a packet results in a collision, the packet is discarded and it must be transmitted again. This adds to the overhead on the network and can reduce the throughput or speed of the network. Larger frames are more likely to collide with each other than smaller frames. You can make the wireless packets smaller by lowering the fragmentation threshold. If you lower the maximum frame size, it can reduce the number of retransmissions caused by collisions, and lower the overhead caused by retransmissions. However, making frames smaller introduces a different kind of overhead. Smaller frames introduce more overhead on the network too. This is especially true on a wireless network, because every fragmented frame sent from one wireless device to another wireless device requires the receiving device to acknowledge the frame. In times of high packet error rates (over five or ten percent collision or errors), lowering the fragmentation threshold can help improve performance of the wireless network. The time that is saved from reducing re-transmissions can be enough to offset the extra overhead added by using smaller packets. This can result in higher throughput. If the rate of packet error is low and you lower the fragmentation threshold, wireless network performance will decrease. This is because lowering the threshold adds protocol overhead and reduces protocol efficiency. The default maximum value 2346 is recommended.

enable secret

Never have. You can't ban this activity ... a "hacker" is an individual who is interested in learning the ins and outs of a particular procedure or device. As a result, there is nothing to "ban".

What can be considered is whether the activities are done illegally or cross a company policy.

TCP/IP hijacking

Ethernet is more "physically secure", in that it is sometimes more difficult to gain unauthorized access to a network, since you need to be in close physical proximity to a network cable. However, it does not require any form of cryptographic authentication to connect to a network, which can be optionally provided by wireless.

Actually, an IDS does not sit on one particular layer. It has to examine packets for protocols, how they are being transported, number of packets transmitted, spoofing information, and application layer information.

In general terms, Intrusion detection system and Intrusion prevention system is a Layer 4 device. It filters for malicious data.

One example of rule-based detection might be to use thresholds. For example, perhaps you have a firewall with a rule that if more than 100 connections per second are initiated from any external source, to block that source. Or , a certain amount of email recipients per one sender might be considered spam detection.

Buy a lan router, they can be used with lan cable or wireless to connect all your computers through a network. If there are only two computers that you wish to connect then you only need on lan cable which you connect in the back of each of those two computers to create a network.

Studying can be different for different people. I've found both the Exam Cram guides and the Passport series of Mike Meyers to be very effective.

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Tunneling, also known as "port forwarding," is the transmission of data intended for use only within a private, usually corporate network through a public network in such a way that the routing node in the public network are unaware that the transmission is part of a private network. Tunneling is generally done by encapsulating the private network data and protocol information within the public network transmission units so that the private network protocol information appears to the public network as data. Tunneling allows the use of the Internet, which is a public network, to convey data on behalf of a private network.

Dijkstra's algorithm has importance when you are trying to find the shortest path between two points. It's used in the computer networking field where routing protocols, like OSPF, uses it to find the shortest path between routers.

http://en.wikipedia.org/wiki/Dijkstra%27s_algorithm

request response paradigm is somthiing which define how request and response work in the web application or in real world.

First when the user open browser and hit any URL, request object is created.

This request object then send to the server. server finds the appropriate resources for that request and executes the logic (if any) ans send back response to the browser. Browser interprets the response and display result

CCNA Exam Details

Exam Name: 200-301 CCNA

Exam Duration: 120 minutes

No. of Questions: 100-120 questions

Passing Score: Varies, usually the score required is 800-850 out of 1000

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Just an online threat, unless you take the term 'firewall' literally and light up a forest. :P

People first, technology second

If you mean people you share the network with, the answer is yes. They can see what you are doing if they have proper software for that. The only way you can protect yourself is to use proxy server, or another kind of encrypted connection.

One can purchase a home network attached security from many different online stores. Some examples of websites that sell NAS's include NewEgg and Amazon.

There are many technical job opportunities in IT security in Boise, Idaho. They range from jobs like Microsoft technology to Cisco router security, etc.

- Operational auditing should be rigorous.

- If the risk involved is great, quality assurance practices in programming should be serious

It depends on the language you want to use. Here is a VB example:

http://bytes.com/topic/visual-basic-net/answers/443023-lrc-calculation-algorithm

Directory Access Protocol

Maybe; it all depends on the employer and the job description in terms of what they expect you to know and duties to perform. There will in any case regardless of degree be some on the job training.

Remember that an information security degree concentrates on the security aspect of networking (among other things) and not the day-to-day process of troubleshooting and extending networks. However, you do (or should have) the preliminary knowledge for network engineer as well.

Quality of Service (QoS) is a technique to manage how well the network is performing. It uses service metrics to figure out where problems and bottlenecks might be in a network and measures transmission times, re-transmits, and other measurable qualities in a network.

There are some protocols and networks that require a high degree of functioning, and the way to tell whether or not the network is functioning properly is by sampling what the network is doing. This is the purpose of QoS.