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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
How much does a network traffic monitor cost?
When shopping for a traffic monitor be prepared to pay atleast $4.00. All occording to which venue you purchase it from.
Why do you have to disable link state routing?
Link state routing must be disabled whenever two or more routing groups are configured to send or receive mail from an Exchange 2007 computer that has the Hub Transport server role installed. (The Hub Transport server was formerly known as a bridgehead server). This is because Exchange 2007 uses Active Directory to determine routing topology. The Exchange 2007 servers do not propagate link state updates. If link state routing is enabled and there is more than one routing group configured to send mail to or from an Exchange 2007 Hub Transport server, routing loops might occur.
How do you connect two wireless routers in separate parts of house with just Ethernet cable?
Wireless routers have spots on the back to plug in ethernet cables. Mine has one input and 4 outputs. It may work if you plug in one wireless router to your modem and then run the ethernet cable from the out of that wireless modem to the in on the other
What is the primary dns in command prompt?
To get your network information from a command prompt, first you need to get your command prompt window open. You can do this from Xp and older by clicking the start button then typing cmd in the "run" box. In windows 7, click on the windows button then type cmd in the "search programs and files" box and the window will come up.
Once you have the command prompt window open, just type ipconfig in that window and hit enter. this will give you lots of useful network information such as your TCPIP address.
you can also type in ipconfig /? to get all of the possible "switches" you can use to get specific info.
How do you find the port number of the remote host?
Instructions
1. Log in to the computer that hosts the remote connection
2. Click "Start" and then type "regedit" into the search box on the Start menu.
3. Go to "HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Terminal Server\WinStations\RDP-Tcp" in the registry.
4. Note the value for the "PortNumber" registry key; this is the port of the remote host on the computer.
Read more: http://www.ehow.com/how_7431393_port-number-remote-host.html#ixzz2ZBN2hEFP
CSU/DSU
DSL modem
A program in an internet user's computer (like yours) capable of interpreting XML sent from a server. Typically a modern web browser, such as Mozilla Firefox, Google Chrome, Microsoft Internet Explorer, Opera Browser, etc.
Mozilla Firefox, for example, shows the hierarchy of an XML very clearly, although it may take a while to load files when they get quite large.
There are also Database Management Systems (DBMS) capable of working directly with XML files internally and most of modern ones offer at least the possibility of importing/exporting them. Most of them include also an XML client.
Even some spreadsheet applications, like Microsoft Excel are able to import/export XML to view and work with its content.
An XML client must be at least able to show the XML information to the user.
What is known as a firewall to ignore all incoming packets that request access to a specific port?
Logical port blocking
What is the difference between private IP addresses and public IP addresses?
public ip-addresses are used in the Internet (they are registered addresses). private ip-addresses are used in local networks.
imagine you have a computer in your local network that has a public ip-address and your PC has simultaneously an Internet connection:
if you try to ping this pc you wouldn't be able to tell which computer is replying, the local one or the webserver.
The router installs all the equal cost paths in the routing table and performs equal cost load balancing to send packets out multiple exit interfaces.
What type of server does a window client use to resolve host names to IP addresses?
Strictly speaking, Windows clients will use a DNS server to resolve host names to IP addresses. In a Windows environment, the DNS server is almost always a Domain Controller as well (Active Directory Integrated DNS). Windows also has another naming system called NETBIOS. Clients will use a WINS server to resolve NETBIOS names (do not confuse with host names) to IP addresses.
Short answer: DNS
proxy service
qos, link aggregation
What command is used to set data speed on a router's serial port to 56 kbps?
The command is: clock rate 56000
So it will appear on the command line interface as:
Router(config-if)# clock rate 56000
Reference: Networking by Jeffrey Beasley Chapter 6 page 216.
What is a plunge router used for?
Usually for starting a cut in the middle of the work piece. It's easier (and safer) then lowering the router down by hand.
Paket Filtering
when the transmission medium has such a long
latencythat the sender's timeout runs out before the frame reaches the receiver. In this case the sender resends the same packet. Eventually the receiver gets two copies of the same frame, and sends an ACK for each one. The sender, waiting for a single ACK, receives two ACKs, which may cause problems if it assumes that the second ACK is for the next frame in the sequence.
What WAN connection types allows you to share bandwidth with other customers for a lower cost?
Packet switched
What are the drawbacks of Address Resolution Protocol?
1.
ARP Flooding
Several viruses send a lot of ARP traffic in an attempt to discover hosts to infect.
A lot of ARP traffic from a single machine, looking for MAC addresses for many of the IP addresses on your local network, there might be a virus on your network that's scanning your network for machines to infect. It's been claimed that the Wootbot virus does this.
2.
ARP Spoofing
- Attacker will know about all data transferring on network
- An attacker in a network may reply to all ARP requests with its own MAC address
- Attacker will maintain its table with actual addresses
- Every host will send data to the attacker
- Attacker will maintain two way transmission between devices, by forwarding and replying all data through itself
What are the two applications of dynamic programming?
1)Multistage graph
2)Travelling salesman problem
