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Computer Network Security
Network security is any form of computer security dealing with multiple computers linked through a network. Questions about everything from firewalls to viruses to denial-of-service attacks belong here.
1,030 Questions
What commands can be used to verify that inter-VLAN communications is functioning?
Using a simple show command will suffice to view that vlan's are configured properly. If the vlan's are configured properly on the routers as well as the switches, then the routers can talk to each other and so can the vlan's.
show ip route - Provides a snapshot of the routing table entries.
ping - verifies connectivity
How can you find about that your computer is secure?
There is no way to say that a given computer system is 'secure'. The only things one can do are to run various tests to verify that the common, known problems of a given operating system have been patched or fixed on the system you are examining. Security is an ongoing task, so if a system is given a 'clean' bill of health one minute it may be vulnerable to a different (possibly at the time unknown) problem at a later date.
There are many security packages one could use to do the initial testing, but considering that security changes from moment to moment there is no clear method of saying you are 'secure', other than at that particular moment in time.
What are wireless deployment mistakes to avoid?
There are no mistakes list to determine which are mistakes. To make sure no mistakes are committed consult a professional.
Authentication is the process of verifying whether a user is authorized or not . We use authentication where we need security that only aurthorized people can have access to a particular data.
In a computer network computers are connected to each other via optic fiber?
veeeeeeeeeeeeery unlikely. most common connection between two pcs would be CAT5/Cat6 (commonly misconceived as Ethernet cable). deploying optic fibre would be unessesary but very fast. it isn't used between computers because of the cost implicated
rip is short for routing information protcol
it is a routing protocol that shared routing tables from 1 router to another to a maximum of 16 hops of 16 routers
What are some examples of network security appliances?
There are many examples of network security appliances. Some examples of network security appliances include the NSA 6600, the NSA 500, and the NSA 4600.
VNC stands for Virtual Network Computing. It is a graphics based system that allows computers to communicate with each other over a 'virtual' network. This means people can access their work computers at home, or their home computers at work.
An attacker can spoof the SSID simply by using an SSID of NULL in all messages.
1) Lack of monitoring during upgrades.
2) System's errors due to lack of NOS to communicate during upgrade
3) Heavy load on Support websites due to questions on the upgrade
4) Depending on where the NOS is located if the systems being upgraded are in the same physical location as live servers there is always the possibility of someone unplugging a wrong cord or overloading a UPS during the upgrade.
5) Employee's misinforming
What are the main advantages and disadvantages of using a layered network architecture?
The following are the advantages of a layered architecture:
Layered architecture increases flexibility, maintainability, and scalability. In a Layered architecture we separate the user interface from the business logic, and the business logic from the data access logic. Separation of concerns among these logical layers and components is easily achieved with the help of layered architecture.
Multiple applications can reuse the components. For example if we want a windows user interface rather than a web browser interface, this can be done in an easy and fast way by just replacing the UI component. All the other components like business logic, data access and the database remains the same. Layered architecture allows to swap and reuse components at will.
Layered architecture enables teams to work on different parts of the application parallely with minimal dependencies on other teams.
Layered architecture enables develop loosely coupled systems.
Different components of the application can be independently deployed, maintained, and updated, on different time schedules.
Layered architecture also makes it possible to configure different levels of security to different components deployed on different boxes. sO Layered architecture, enables you to secure portions of the application behind the firewall and make other components accessible from the Internet.
Layered architecture also helps you to test the components independently of each other.
The following are the disadvantages of a layered architecture:
There might be a negative impact on the performance as we have the extra overhead of passing through layers instead of calling a component directly.
Development of user-intensive applications can sometime take longer if the layering prevents the use of user interface components that directly interact with the database.
The use of layers helps to control and encapsulate the complexity of large applications, but adds complexity to simple applications.
Changes to lower level interfaces tend to percolate to higher levels, especially if the relaxed layered approach is used.
What steps need to be taken when assessing the risk of a data breach?
The steps we took to assess one of our largest ever data breaches was simple, but the process was long and difficult. What we were first needed to figure out was how many total records were breached. Then, we needed to figure out what type of data was in those records and the source of the breach. Perhaps the most difficult and time-consuming aspect of all of this was the time we spent researching and trying to figure out how the data was used and if it was.
What is a network types of network and how network mission is critical in business?
network is connection of two or more computers .
three main types of network:
1.LAN(local area network) means-LAN are confined to a small area.Usually,this small area is within a single building,although it need not be confined to just a single office.
Sometimes LAN's spread through several buildings on the same site.
2.MAN (METROPOLITAN AREA NETWORK) means-A MAN is a computer network run by one (1) organisation that connects together several LAN's across a larger area such as a city.It is larger than a LAN
3.WAN (WIDE AREA NETWORK) means-A WAN is a computer network spread over a very large area,and uses satellite and other connection rather than cable
there are also 2 others
4. CAN (campus area network)
5. PAN (personal area network)
1.PEER-TO-PEER2.CLIENT/SERVERBUISNESS DATA & INFORMATION CAN BE SHARED BY DIFFRENT BUISNESS ORGANISATIONS SITUATED AT DIFFRENT LOCATION.
IDENTIFYING JOB OPENINGS AND ARRANGING MEETINGS WITH THE PEOPLE WHO WILL MAKE THE HIRING DECICIONS
What is the difference between promiscuous mode and inline mode?
Inline is used to look at a specific location such as between two routers, where as promiscuous mode captures traffic using a capture device such as a hub or switch, this way all traffic that goes through the device is monitored.
I you are asking what the false-acceptance rates (FAR) are ... it depends on the type of biometric and how the sensitivity is set. The tighter you set the tolerances, the fewer false acceptances you get, but the more false rejections (FRR) you get.
Typically:
Fingerprint: 1% FAR at 10% FRR, 0.01% FAR at 20% FRR
Hand-print: Better than fingerprints - somewhere in the neighborhood of Retina scans
Iris: more intrusive but more accurate than retina scans
Retina: better than fingerprints, less than Iris. Affected by health - prone to false rejections when health changes
Voice: highly variable - affected by health (ever had a sore throat?)
Facial recognition: 1% FAR at 10% FRR, 0.01% FAR at 30% FRR
... of course there are other biometrics that can be used, there are just some examples and YMMV.
Usually Bio-metrics needs to be combined with another authentication method to achieve strong security - but with another method - even if the other method is a second bio-metric - it is very strong.
If you are asking a bout how secure the database of bio-metric information is... that's just a general question of how secure the computer system is. Improperly secured it would be a tasty target for an attacker seeing PII on individuals.
How is blocking related to a crossbar switch?
: Blocking can occur when two switch inputs attempt to access the same intermediate switch channel.
