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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
What is the type of server that assigns IP addresses to computers on a network?
DHCP allows a computer to join an IP-based network without having a pre-configured IP address. DHCP is a protocol that assigns unique IP addresses to devices, then releases and renews these addresses as devices leave and re-join the network. Most home and business routers have a built in DHCP server that can be configured to do this.
What is the most common Ethernet frame type used on modern networks?
Ethernet_II
Network + Guide to Networks (version 5) pg. 217
The direction of the data flow can be described as:
1. Simplex
2. Half duplex
3. Full duplex
1. Simplex:- In Simplex data flows in only one direction on the data communication line (medium).
Examples are radio and television broadcasts. They go from the TV station to your home television
2. Half duplex:-In Half-Duplex data flows in both directions but only one direction at a time on the data communication line. For example, a conversation on walkie-talkies is a half-duplex data flow
3. Full-Duplex: In full duplex data flows in both directions simultaneously. Modems are configured to flow data in both directions
Is CAN protocol duplex or half duplex?
CAN is half-duplex. One differential pair means one message at a time.
Which cable is used to connect a switch to a server?
Firstly, is your server assigning IP Addresses, or do you already have a router or something. All you really need to hook a switch up to anything is a patch cable. If this is just a file server, acting as a client on a peer to peer network, you just need to make sure every computer on the network is getting an IP and are on the same subnet and workgroup.
What are two critical tasks that your network to help you accomplish?
identifying job openings and arranging meetings with the people who will
make the hiring decisions.
What is root switch in spanning tree protocol?
Based on the location of the root bridge, theother switches determine which of their ports has the lowest path cost to the root bridge. These ports are called root ports, and each switch (other than the current root bridge) must have one.
What is a data communication model?
Communication is the conveyance of a message from one entity, called the source ortransmitter, to another, called the destination or receiver, via a channel3 of some sort. A simple example of such a communication system is conversation; people commonly exchange verbal messages, with the channel consisting of waves of compressed air molecules at frequencies which are audible to the human ear.4 This is depicted in Figure 0.1.
What is the T-568 A AND T-568 A Ethernet wire?
T-568A and T-568B are two types of wiring for the connectors on ethernet cables. Both standards work fine, but you can not intermix the two types of connectors on a single cable. You can have mixed cables on a network as long as each individual cable is wired the same on both ends. (Example, one patch cable uses t568a on both ends, a different cable uses t568b on both ends, and a third uses a matching, but different color pinout)
Some cable is labeled 568a or 568b. This means that the 4 twisted pairs (for a total of 8 little cables) inside the jacketed ethernet cable is made for a certain type of connection. For example, cat 6 cable is higher quality, rated for up to 10GB network use. There are more twists per inch of those little wire pairs inside the jacket of the cable to help reduce crosstalk and interference. I have some cat 6 cable labeled 568b, and of the 4 twisted pairs, some have more twists then others. corresponding to what the data pairs are in the cable. I assume this is a cost cutting measure as more twists means more wire inside of those ethernet cables. Better quality cable should have equal amounts of twists per inch so that either 568a or 568b connections can be used without having to worry about what the cable specifies.
upper-layer connection-oriented protocols
DPD (UK) hub 1 is located in Smethwick, Birmingham.
This is also the main hub for Interlink Express and Interlink Direct.
DPD & Interlink are subsidiaries of GeoPostUK, a division of French postal group, LaPoste.
Name an advantage of setting up file sharing at the same time as printer sharing?
A High Quality and Costly Printer can be Shared...!!
Space for keeping No. of Printers can be saved
Which layer of the OSI model encapsulates Network layer pockets?
the network layer --> check your question.
^^^^^^^^^^^^^^^^^^^^^^^^^^^
That is totally not the right answer, how about you actually read the book for the course.
It is the data link layer that does encapsulation.
I agree - its the Data Link Layer which encapsulates the Network layer...NOT the Network Layer.
What is the origin of the Internet and how does it work?
The Internet is a worldwide network of interconnected computers that allows users to access and transfer information remotely. The information viewed on the Internet is actually not on the Internet at all, but rather on other computers, and viewed via the Internet. The most popular service accessed through the Internet is the World Wide Web (WWW). The Web and the Net are often considered to be synonymous but actually represent two different things. Whereas the Internet is the means for accessing information, the Web is composed of the visual display of the information being accessed.
See related links for a Web Guide to the Internet, which explains the history, origins, and functionality of the Internet.
What is the difference between DNS and proxy server?
It is a protocol, that changes name such as www.google.com to a unique IP adress.
LED, which stands for Light Emitting Diode, generate light using a semiconductor material. As the voltage is applied to the semiconductor, the energy that is used by the LED is converted into light energy.
Different semiconductors produce different types of light. Red and green were discovered first, followed by yellow, orange, blue and finally white.
This is usually Green and No chemicals , dont care, dont know
What is the difference between firewall and access list?
Firewalls control all incoming and outgoing connections and if it's required block it or limit. Firewalls work with software, but not with accounts. Access lists control permissions and read-write rights for users (accounts) with certain username and password (if required).
What is the cable that connects a hub to a hub?
PATCH CABLE
Patch cables provide a short-range connection, while longer Ethernet cables (usually Category 5, Category 5e, or Category 6) are used to connect to a hub up to 100 meters away.
Mac does not support 128-bit local network encryption, so - oddly - you must "enable" local network encryption... and then turn off the encryption! You must do this for every computer that you want your Mac to be able to see. Mac will see only "Shared" or "Public" folders, so you will need to move files you want to share to those folders. (Mac and Windows do not talk through Homegroup on Win7.)
Windows 7:
1) Click the START button and in the command text box enter "Security Policy"
2) The Local Security Policy box will open. (You must have administrator privileges to continue).
3) Click on the arrow next to "Local Policies"
4) Click on "Security Options" in the list that opens
5) Scroll down the right list until you find "Network Security: LAN Manager authentication level" and double-click that listing.
6) From the dropdown box that appears, change this setting to "Send LM & NTLM - use NTLMv2 session security if negotiated"
7) Click OK
8) Next find "Network security: Minimum session security for NTLM SSL based (including secure RPC) servers
9) Uncheck the box next to "Require 128-bit encryption"
10) Repeat if you have more than one of these listings
11) Click OK and close the security policy window
Windows XP
1) Enable File sharing from the Control Panel
2) Use the Shared Folders and move files there. It is possible to share from users folders, but this requires matching Users accounts in both MAC and Windows via SMB file sharing (not covered in this answer).
MAC side
- Launch System Preferences by clicking its icon in the Dock.
- Click the 'Network' icon in the System Preferences window.
- Select 'Edit Locations' from the Location dropdown menu.
- Create a copy of your current active location.
- Select your active location from the list in the Location sheet. The active location is usually called Automatic, and may be the only entry in the sheet.
- Click the sprocket button and select 'Duplicate Location' from the pop-up menu.
- Type in a new name for the duplicate location or use the default name, which is 'Automatic Copy.'
Click the 'Done' button.
- Click the 'Advanced' button.
- Select the 'WINS' tab.
- In the 'Workgroup' field, enter the same workgroup name you're using on the PC.
- Click the 'OK' button.
After you click the 'Apply' button, your network connection will be dropped. After a few moments, your network connection will be re-established, with the new workgroup name you created. Tha MAC settings below will show you the MAC side to do this; for the Windows XP side, simply right-click the folder and enable sharing with the MAC user.
- Click the 'Apply' button.
You will need to go into your System Preference > Sharing settings to activate the specific users and folders to share bidirectionally.
