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Local Area Network

Questions concerning the setting up, troubleshooting and operation of wired LANs used by businesses and other organizations

4,003 Questions

What is a network hub/switch?

A hub is a repeater reading electronic signals from a cable and replicating them on all other interfaces (broadcast).

a switch operates at Layer 2 of the OSI model forwarding frames to their destination/next hop only (rather than to every address connected like a hub).

Switches facilitate simulcast (1 to 1), Multicast (1 to many) and broadcast (1 to all).

Describe how packet loss can occur at output ports?

Output ports can transmit only a single packet in a unit of time (the packet transmission time), the arriving packets will have to queue for transmission over the outgoing link. There could be more packets arriving from the switching fabric at the output port while the output port is still working on sending the packets that are already on the queue. Eventually, the number of queued packets can grow large enough to exhaust the memory space at the output port, in which case packets are dropped or lost.

What is the difference of cat 5 and cat 5e?

Difference between a cat 5 5e and 6 networking cable?

Cat5 cable is broken into two separate categories: Cat5 and Cat5E cables. Cat5 has become obsolete in recent years, due to its limitations compared to Cat5E and Cat6 cables. Although the Cat5 cable can handle up to 10/100 Mbps at a 100MHz bandwidth (which was once considered quite efficient), the newer versions of Cat cables are significantly faster.

Cat5E cable (which stands for "Cat5 Enhanced") became the standard cable about 15 years ago and offers significantly improved performance over the old Cat5 cable, including up to 10 times faster speeds and a significantly greater ability to traverse distances.

Cat6 cables have been around for only a few years less than Cat5E cables. However, they have primarily been used as the backbone to networks, instead of being run to workstations themselves. The reason for this (beyond cost) is the fact that, while Cat6 cables can handle up to 10 Gigabits of data, that bandwidth is limited to 164 feet - anything beyond that will rapidly decay to only 1 Gigabit (the same as Cat5E).

Cat6A is the newest iteration and utilizes an exceptionally thick plastic casing that helps further reduce crosstalk. The biggest distinguishing difference between Cat6 and Cat6A cables is that Cat6A can maintain 10 Gigabit speeds for the full 328 feet of Ethernet cable.

What is class D default sub net mask?

Seems to me, I'm still learning, that the Class D subnet mask would be 224.0.0.0 or 1110 0000.0000 0000.0000 0000.0000 0000 in binary. The Internet has been using classless subnets for a while now, so it may not be as relevant as it once was.

How do you connect three computers using an ethernet switch without an internet connection to play games?

For this type of connection you will need to use a *crossover* ethernet cable, not a standard patch cable. This will allow two computers to network with eachother. You can then use the network wizard (if you use windows xp or vista) and choose to create a home network. You will need to assign each computer a unique IP address so they can find eachother, as well as a unique computer name.

What does an ip address of 169.254.0.12 indicate?

Nothing. That is not a valid IP address as its stands however ip addresses with the first 2 octets of 169.254.xxx.xxx means that Automatic Private IP Addressing has been enabled because no DHCP server was found and no static address has been defined.

How do you find the net id and host id of ip address 220.43.6.8?

To find the Network ID and Host ID from an IP address you need to use a Subnet Mask. The address 220.43.6.8 is a class C IP address (Since the range of Class C address is 192.0.0.0 to 223.255.255.255).
The standard default mask for class C is 255.255.255.0


Network address = (IP address) Boolean AND (Subnet mask)
Hence,
network address = 220.43.6.8 AND 255.255.255.0 = 220.43.6
(since 255 means all 1s in binary, hence it'll give the same bits which are ANDed with it, whereas 0 means all 0s in binary, hence it'll give answer as 0 irrespective of what bits are ANDed with it)


Hence Host Address would be the remaining part of IP address = 8

In which layer of osi model dose repeater works?

It depends on what kind of model it is, but in the model for computer 321O, it is on the layer between trhe keyboard and the behind screen, and there is a button with the osi code and there says everything.

Difference between twisted pair cable and coaxial cable?

Coaxcial cable is typically a copper core cable with a shield separated by an air gap. It carries electrical signals along the center conductor relative to ground (usually the outer shield is tied to ground.

Fibre optic cable is glass strands which carrry light in the form of pulses rather than electrical currents.

Fibre carries a digital signal whilst copper (coaxial) commonly carries an analogue signal.

What is the max distance for a coax Ethernet access?

It depends on the type/speed.

For 100 mbit/s twisted-pair (CAT5/6), it's 100 metres, for 1000 mbit/s - 1 gBit/s it's also 100 m *with the correct cable* and no sneaky tight bends/ overdone cable ties.

The older coaxial cables gave 185 m, 500 m, but these are obsolete.

The longest total length for ethernet is 100m, or just a bit over 300 feet. That is for pure cable lengths between any device that would regenerate the signal, such as a switch or hub. The problem is if the signal is to degradded by the time it reaches the device it can't be regenerated properly.

What 3 parts of a data packet?

the answer is a Header,the a Payload, then last is the Trailer

Pros and cons of wireless LAN?

Pros- wireless gives you more room to use the item, and u dont have to worry about the cords getting tangled and so on. Wireless also depending on the item, can run at a faster pace then wired.

Cons- The main bad thing about wireless is keeping track of your receiver. usually with wireless there's some sort of a receiver that connects your wireless item. So if you lose the reciever you r screwed and will have to buy another wireless item. Another problem is with wireless, it usually always runs on battery which means recharging. Recharging can sometimes take a few hours to get to full battery. Or it requires you buying batterys if it is for example AA or a non-rechargeable.

I currently use wireless at home because buying batterys or losing my reciver is never a problem for me. Hope this helped out a bit. need more in depth email me at Burle35@gmail.com

Advantages and disadvantages of lan and wan?

Advantages Of WAN

  • Covers a large geographical area so long distance businesses can connect on the one network
  • Shares software and resources with connecting workstations
  • Messages can be sent very quickly to anyone else on the network. These messages can have pictures, sounds, or data included with them (called attachments).
  • Expensive things (such as printers or phone lines to the internet) can be shared by all the computers on the network without having to buy a different peripheral for each computer.
  • Everyone on the network can use the same data. This avoids problems where some users may have older information than others.
  • Share information/files over a larger area
  • large network cover

Disadvantages Of WAN

  • Are expensive and generally slow
  • Need a good firewall to restrict outsiders from entering and disrupting the network
  • Setting up a network can be an expensive and complicated experience. The bigger the network the more expensive it is.
  • Security is a real issue when many different people have the ability to use information from other computers. Protection against hackers and viruses adds more complexity and expense.
  • Once set up, maintaining a network is a full-time job which requires network supervisors and technicians to be employed.
  • Information may not meet local needs or interests
  • Vulnerable to hackers or other outside threats
A:Occupants in two buildings can share a wireless connection to a network such as a large corporate network that demands connectivity. But a disadvantage is that the signal is strong enough for anybody passing by to use for their own benefit without paying. You may have internet service flowing through your house on a wireless router and your neighbor may creep up close to your house and share your internet connection with you. So without security this technology is a blessing and a curse at the same time

What do switches do in the home network?

You can use a switch to connect different pieces of equipment. For example, a standard ADSL router only has a port for a single Ethernet cable. If you want to connect 2 or more computers to the Internet, you can use a switch. In this case, the ADSL router and each computer connect to the switch, via a standard Ethernet cable.

If you don't have an Internet connection, you can still set up a home network to share files, etc. To connect only 2 computers, you can connect them directly via a crossover cable. To connect more than 2 computers, better use a switch.

You can use a switch to connect different pieces of equipment. For example, a standard ADSL router only has a port for a single Ethernet cable. If you want to connect 2 or more computers to the Internet, you can use a switch. In this case, the ADSL router and each computer connect to the switch, via a standard Ethernet cable.

If you don't have an Internet connection, you can still set up a home network to share files, etc. To connect only 2 computers, you can connect them directly via a crossover cable. To connect more than 2 computers, better use a switch.

You can use a switch to connect different pieces of equipment. For example, a standard ADSL router only has a port for a single Ethernet cable. If you want to connect 2 or more computers to the Internet, you can use a switch. In this case, the ADSL router and each computer connect to the switch, via a standard Ethernet cable.

If you don't have an Internet connection, you can still set up a home network to share files, etc. To connect only 2 computers, you can connect them directly via a crossover cable. To connect more than 2 computers, better use a switch.

You can use a switch to connect different pieces of equipment. For example, a standard ADSL router only has a port for a single Ethernet cable. If you want to connect 2 or more computers to the Internet, you can use a switch. In this case, the ADSL router and each computer connect to the switch, via a standard Ethernet cable.

If you don't have an Internet connection, you can still set up a home network to share files, etc. To connect only 2 computers, you can connect them directly via a crossover cable. To connect more than 2 computers, better use a switch.

Explain each type of network devices with its function?

Computer network devices also known as communication devices and they constitute a data communication network. These devices are routers, switches, hubs, LAN cards, gateway, modems, hardware firewall, CSU/DSU, ISDN terminals and transceivers. In an Ethernet or WAN network, the data communication cannot be performed without these devices. Being an IT professional or a network administrator, you must have the good understanding of these devices.

What is the minimum number of computers required for a network?

There must be at least 2 computers to form a network. However, a standalone machine that is connected to the Internet (which is itself a vast network of computers) is considered part of that network and is therefore regarded as a subnet even though there's only one machine in that subnet.

How can you determine the ip address of a network printer?

If you have physical access to the printer take a look at the printer's configuration menus or have the printer print it out.

You can try pinging the printer by name to see if it responds or if you have access to the print queue configuration information it will be listed there.

What is the major advantage of shielded twisted-pair over unshielded twisted pair cable?

UTP-Unshielded Twisted Pair. Normally UTP contains 8 wires or 4 pair. 100 meter maximum length. 4-100 Mbps speed.

STP-Shielded twisted pair. 100 meter maximum length. 16-155 Mbps speed. Lower electrical interference than UTP

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