Computer Networking

In the computer and networking industry, a traceroute is used to display the path and transitioning delays for packets across an IP network. It is used on a number of systems.

Network mapping uses a protocol called LLTD (Link Layer Topology Discovery) to find computers and devices on a network and displaying them in a schematic way on your screen. More information about using this protocol can be found on the Microsoft website.

Usually it will be on the side of the device, like where the bar code/serial number is. but if it is not, then resort to the manual that came with the equipment for further information.

"Enter Dyson. I'm sure you have seen the advertisements with James Dyson proclaiming that his invention is the best, because the vacuum never loses suction. The problem is that I just wasn't willing to part with $400-600 for a floor cleaner, no matter how fancy its cyclone technology promised to be."

A network traffic monitor basically analyzes the network usage in local areas and then provides you with statistics of the upload and download rates. It does this by monitoring IP addresses between your local area and the internet.

Host A was assigned a network address.

Host B was assigned a multicast address.

Host A and Host B belong to different networks.

**The gateway address was assigned a broadcast address.

Both Token Ring and FDDI use the concept of a ring topology structure. However, Token Ring is used in a LAN, and FDDI is used in a MAN.

Token Ring is implemented with copper cable (UTP cable) and FDDI uses Fiber Optic cable.

Finally, the protocols are very different between the two. FDDI uses a synchronous type of transmission, where Token Ring uses an actual token (a 3 character packet) to control who has access to transmit or receive on the network. FDDI does not use this technique.

Presentation layer

AVB is an acronym for Audio Video Bridging. AVB packets are usually packets derived from the IEEE standards that enable the transmission of audio and video packets over standard ethernet. Those standards include IEEE802.1Qat, IEEE802.1Qav, and IEEE802.1AS.

If you connect to the router via the console port then you are physically making a connection with a physical cable to the router. This implies you have to be close to the router itself.

Using telnet allows you to connect to the router from anywhere in the network, and doesn't require a physical cable connection.

T1 or ISDN data circuits. Wire pairs 1,2,4, and 5 are used. One pair for transmit, one pair for receive.

All company networks these days are client-server networks. A server is no more then a computer offering one or more services to other computers. Such service can be as simple as file sharing, printing or access to the internet. A lot of people also have a client-server network at home. Many people have a computer system or NAS offering file storage for all computer systems, or have a computer allowing others to use it's printer

There are two main causes, malformed packets, which could be a computer forming the communications in the protocol suite (TCP/IP) incorrectly.

A much more common problem is a chattering NIC, which is a computer sending out communication bursts, even though other computers are trying to communicate with it.

To configure a Cisco PIX 515 Firewall, first, connect your Cable or DSL modem to the Ethernet 0 interface on the firewall with a Straight-Through Ethernet RJ45 cable. Then, connect another Straight-Through Ethernet RJ45 cable from the Ethernet 1 interface on the firewall, to an available port on a switch or hub. Then, connect the blue rollover cable from the Console port on the Cisco PIX 515, to the serial port on your computer. Then, turn the firewall on. Then, open HyperTerminal. Once you open HyperTerminal, type in any name that you want to use. Then, select any icon. Then, click OK. Then, next to "Connect Using," select the proper serial port, that you connected the rollover cable to. Then, click OK. Next to "Bits per second," select 9600. The "Data bits" should be 8, the "Parity" should be none, and the "Stop bits" should be 1. Next to "Flow control," select none. Then, click OK. Then, press Enter on your keyboard. If it asks you to perform an initial configuration, type no. Now, you should be at the firewall's prompt, which should look similar to pixfirewall>. The commands below are using pixfirewall as the prompt. Now, follow the commands below:

pixfirewall> enable

(If applicable, type in a password. If no password was assigned to the firewall, just continue).

pixfirewall# configure terminal

pixfirewall(config)# nameif ethernet0 outside security0

pixfirewall(config)# nameif ethernet1 inside security100

pixfirewall(config)# name x.x.x.x pix_outside

(Note - The x.x.x.x represents your "outside" IP Address, or the IP Address that your ISP is giving you).

pixfirewall(config)# name x.x.x.x PIX_inside

(Note - The x.x.x.x represent the IP Address for the local network interface on the firewall (the Ethernet 1 interface).

pixfirewall(config)# interface ethernet0 100full

pixfirewall(config)# interface ethernet1 100full

pixfirewall(config)# ip address outside pix_outside 255.255.255.0

(Note - The 255.255.255.0 here assumes that it is the subnet mask for your Internet connection. If your Internet connection uses a differnet subnet mask, replace that subnet mask with the correct subnet mask).

pixfirewall(config)# ip address inside pix_inside 255.255.255.0

(Note - The 255.255.255.0 here assumes that your local network (inside network) uses that subnet mask. If you are using a different subnet mask for your local network, replace that subnet mask with the correct subnet mask).

pixfirewall(config)# ip address inside x.x.x.x

(Note - The x.x.x.x represents the IP Address for the local network interface on the firewall (the Ethernet 1 interface).

pixfirewall(config)# outbound 10 deny 0.0.0.0 0.0.0.0 0 ip

(Note - The 2 outbound commands below only allow ports 80 and 443 to go outbound. If you do not want to block any ports that go outbound, do not type the following 2 commands in).

pixfirewall(config)# outbound 11 permit 0.0.0.0 0.0.0.0 80 tcp

pixfirewall(config)# outbound 12 permit 0.0.0.0 0.0.0.0 443 tcp

(Note - The command below is used if you do not want to block any outbound ports).

pixfirewall(config)# outbound 10 permit 0.0.0.0 0.0.0.0 0 ip

pixfirewall(config)# NAT (inside) 1 0 0

pixfirewall(config)# Global (outside) 1 interface

pixfirewall(config)# route outside 0 0 <gateway IP address> 1

(Note - The Gateway IP Address is the Default Gateway for your Internet connection, that your ISP is giving you).

pixfirewall(config)# write memory

This completes the configuration of the Cisco PIX 515 Firewall.

they do stuff like ere wellu know



A Job Description clearly describes what is the necessity actually. You can find few samples Job Descriptions here Administrator Job Description

One computer on a network will drop another if both computers are using the same IP Address.

This can be solved by assigning both computers automatic IP address, and Windows will automatically deal with the network issue.

Discuss reasons as to why a device driver is needed to be installed and what importance does it have?

it is not UPT ,it is UTP which stands Unshielded Twisted Pair. The UTP is mainly used for network cabling i.e; LAN cabling.

NO

International Standards Organization (ISO) developed a proposal for OSI model as a first step towards international standardization of the protocols used in the various layers. The model is known as the ISO OSI (Open Systems Interconnection).The OSI model includes seven layers

Yes, mbps refers to megabits per second. The more data transfer per second, usually the better quality. It is much more recommended to use a higher bit rate quality.

Switching

check whether you have assign IP address for the wireless network manually or not. if you are given IP manually it won't detect any of available networks and you will not able to connect to wifi networks. just go to network and sharing center ( you can right click on network icon in the taskbar and open network sharing center then select your wireless network,

then select properties > go to TCP IP V4 and V6 setting and give select obtain IP address automatically. then it will detect the new wifi network and if the wifi network are secured you will ask for the password to connect to it. by giving the password of the wifi network you can connect to your wireless network.

in all laptops you will find a wifi button please be aware to switch on your wifi button before you connect.

For more solutions & information please visit.

http://www.techyv.com/questions/my-laptop-cannot-find-any-wifi-signal

A 4p server has 4 CPU socket in one motherboard; i.e. 4 physical CPU's(not just cores or threads) on one motherboard. A 2p server has dual CPU.