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Computer Networking
Computer networks are collections of computers which are connected together in order to communicate and transfer information. Questions about computer networks, networking protocols, and how to set them up belong here.
18,810 Questions
the u in udp stands for unreliable and since email is important it is sent using tcp through say smtp or pop3
How client server system can provide connectivity?
Connectivity is provided via network connections, usually via a wired network connection of some kind.
DNS and DHCP
It will slow down to any devices connected to the 10 Mbps hub. Other connections should not be affected.
Can you turn off the wireless signal on a belkin n1 router?
to turn off the wireless signal, you only need to unplug the router. if that is no good for your purposes, go to www.whatismyip.com and type the IP it gives you into your address bar. this redirects you to the router setup, where you may be able to turn the wireless signal off
Where can you find a driver for a WRT54g Linksys Router?
You shouldn't need a driver for a router. Open your browser and go to 192.168.0.1
shared computing
What devices besides pcs will eventually run on wireless lan?
Printers and Fax Machines, Game Decks (PS3, X-Box 360), and Home Theater Systems are just a few that already exist today.
What is the output of the ping command?
It depends if you can communicate with the distant end or not.
Successful pings will look like this:
lap:~$ ping google.com
PING google.com (66.102.7.99) 56(84) bytes of data.
64 bytes from lax04s01-in-f99.1e100.net (66.102.7.99): icmp_seq=1 ttl=50 time=65.7 ms
64 bytes from lax04s01-in-f99.1e100.net (66.102.7.99): icmp_seq=2 ttl=50 time=62.2 ms
64 bytes from lax04s01-in-f99.1e100.net (66.102.7.99): icmp_seq=3 ttl=50 time=66.4 ms
64 bytes from lax04s01-in-f99.1e100.net (66.102.7.99): icmp_seq=4 ttl=50 time=64.5 ms
^C
--- google.com ping statistics ---
4 packets transmitted, 4 received, 0% packet loss, time 3003ms
rtt min/avg/max/mdev = 62.262/64.749/66.417/1.586 ms
Unsuccessful ping attempts will look like this:
lap:~$ ping 192.168.1.244
PING 192.168.1.244 (192.168.1.244) 56(84) bytes of data.
From 192.168.1.147 icmp_seq=1 Destination Host Unreachable
From 192.168.1.147 icmp_seq=2 Destination Host Unreachable
From 192.168.1.147 icmp_seq=3 Destination Host Unreachable
^C
--- 192.168.1.244 ping statistics ---
6 packets transmitted, 0 received, +3 errors, 100% packet loss, time 5020ms
, pipe 3
How is a message transmitted thru a glass fiber?
It's send in the form of a laser beam - which reflects internally.
In what ever temp download folder your browser uses.
The easiest way to find it would be to use MS Words recently opened files function.
Can you describe the fhss and dsss spread spectrum technologies?
"Direct Sequence Spread Spectrum (DSSS)
DSSS multiplies the data bits by a very fast pseudo-random bit pattern (PN sequence) that "spreads" the data into a large coded stream that takes the full bandwidth of the channel. DSSS is the basis for CDMA cellphones and 802.11 Wi-Fi wireless transmission. For a technical example of DSSS technology, see cdma.
Frequency Hopping Spread Spectrum (FHSS)
FHSS continuously changes the center frequency of a conventional carrier several times per second according to a pseudo-random set of channels, while chirp spread spectrum changes the carrier frequency. Because a fixed frequency is not used, illegal monitoring of spread spectrum signals is extremely difficult, if not downright impossible depending on the particular method. FHSS is the transmission technology in Bluetooth. See integrated-business-systems-and-services-inc, wifiand bluetooth."
From spread-spectrum
List four technique used by firewalls to control access and enforce a security policy?
Techniques used by firewall:
There are four general techniques that firewall use to control access and enforce the sites security policy:
- Service Control:
Determines the types of internet services that can be accessed, inbound or outbound.
Firewall may filter traffic on the basis of IP address and TCP port number.
It may provide proxy software that receives and interprets each service request before passing it on.
It may host the server software itself such as a web or mail service.
- Direction control:
Determines the direction in which particular service request may be initiated and allowed to flow through firewall.
- User control:
Control access to a service according to which user is attempting to access it. This feature is applied to users inside the firewall perimeter. It may also be applied to incoming traffic from external users. But it requires some form of secure authentication technology.
- Behavior control:
Controls how particular services are used. For eg.the firewall may filter email to eliminate spam or it may enable external access to only a portion of the information on a Local web server.
How often do you run computer network security?
If a computer system is operating then it should be utilizing network security. So the answer would be all the time.
Screening
What network monitoring tool graphs system and network information over time?
A networking monitoring tool that graphs system and network information over time is Cacti. Cacti also offers templates, fast pollers and data acquisition methods as well.
What identifies both the logical host and the logical network addresses?
The IP protocol identifies both the logical host as well as the logical network addresses...........
How do you enter username and password with a batch file?
You can use the run as command in the batch file if you are using windows xp and i think with wondows 2000, unfortunatly it is open text so you have to use another programme to do that.
What is the workgroup database?
In work group database approach , consists 20-25 members those team of people will develop a database of an organization . The work group database is designed to support to maintain database by a group of people.
You must first purchase and install the required hardware. The wireless router which is connected to your desktop by cable, and Wireless network adapters for each device on the wireless network. Newer laptop computers have wireless adapters built-in . Separate USB adapters must be purchased for computers that don't have that built-in capability If you use Windows XP, then run the Home Networking Wizard. Go to Start/My Network places/ and under Network Tasks click on "Set up a Home or Small Office Network". This launches a wizard that will guide you through the process. You must run the wizard on the desktop computer first. At the end of that process, you will be told to make a copy on removable media, such as a CD, and then run the copy on the laptop. If you're not running Windows XP it can be a little different.
This should be an invalid MAC address because the first octet is 9 bytes long. However it converts out to BA:11:55:18:AA:F. However this is not a real MAC address since the OUI (first three octets are not registered to any corporation.) Here are the results of your search through the public section of the IEEE Standards OUI database report for BA:11:55: Sorry! The public OUI listing contains no match for the query BA:11:55
If you want to know the math behind it it becomes tricky. Hex is a 16 base system. We're used to a 10 base system 0-9. Hex runs 0-16 so it counts like this
0=0
1=1
2=2
3=3
4=4
5=5
6=6
7=7
8=8
9=9
A=10
B=11
C=12
D=13
E=14
F=15 So to count by Hex 0F would =15
Then 10 would = 16. You cannot look at it like a ten, it is a one, zero. that's one group of 16 and 0 ones. So 20 (two zero) would equal 32 (two sixteens)
With the basics of hex we can convert the binary to decimal.
To count by binary we once again have to thing a bit differently. while they look like a bunch of ones and zeros they each stand for a different number with each place multiplying the previous number by 2. So it counts 1,2,4,8,16,32,64,128. Only it is read right to left 128,64,32,16,8,4,2,1 The binary number 10101010 can be calculated like this 128 64 32 16 8 4 2 1
1 0 1 0 1 0 1 0 So that is one of each 128,32,8,2
128+32+8+2=170 to convert this 170 to hex we can devide it by 16 170/16=10.625
That gives us 10 full groups of 16 which is a Hexidecimal (A) or 160. This leaves us with a remainder of 10, which we know is another (A). So the Hex for 10101010 = AA
