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Cisco
Cisco Systems, Inc. is a major IT company, which produces networking equipment and network management solutions for both personal and commercial use. Questions about this company and its products belong here.
1,095 Questions
What are physical communication media?
# Twisted pair - Wire twisted to avoid crosstalk interference. It may be shielded or unshielded. #* 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. # Coaxial - Two conductors separated by insulation such as TV 75 ohm cable. Maximum length of 185 to 500 meters. ## Thinnet - Thinnet uses a British Naval Connector (BNC) on each end. Thinnet is part of the RG-58 family of cable*. Maximum cable length is 185 meters. Transmission speed is 10Mbps. Thinnet cable should have 50 ohms impedance and its terminator has 50 ohms impedance. A T or barrel connector will have no impedance. Maximum thinnet nodes are 30 on a segment. One end of each cable is grounded. ## Thicknet - Half inch rigid cable. Maximum cable length is 500 meters. Transmission speed is 10Mbps. Expensive and is not commonly used. (RG-11 or RG-8). A vampire tap or piercing tap is used with a transceiver attached to connect computers to the cable. 100 connections may be made. The computer has an attachment unit interface (AUI) on its network card which is a 15 pin DB-15 connector. The computer is connected to the transceiver at the cable from its AUI on its network card using a drop cable. Maximum thicknet nodes are 100 on a segment. One end of each cable is grounded. 3. Fiber-optic - Data is transmitted using light rather than electrons. Usually there are two fibers, one for each direction. Cable length of 2 Kilometers. Speed from 100Mbps to 2Gbps. This is the most expensive and most difficult to install, but is not subject to interference. Two types of cables are: 1. Single mode cables for use with lasers has greater bandwidth and costs more. Injection laser diodes (ILD) work with single mode cable. 2. Multimode cables for use with Light Emitting Diode (LED) drivers. All signals appear to arrive at the same time. P intrinsic N diodes or photodiodes are used to convert light to electric signals when using multimode.
{| ! Media ! Distance(meters) ! Speed ! Approx Cost/station | UTP 100 4-100Mbps $90 STP 100 16-155Mbps $125 Thinnet 185 10Mbps $25 Thicknet 500 10Mbps $50 Fiber 2000 100Mbps-2Gbps $250 (multimode) |}
A process or mechanism responsible for the development or motion of a system.
Continuous activity, change, progress (vigor).
Philosophical or theories systems that explain the universe in terms of energy or force.
It is abit like Universal Dynamism which is an art term used to describe moving objects or shapes.
If a client send a query requesting for a particular web page to the DNS server and if the DNS server resolves the page from the other DNS servers & it will be store the same page in the DNS cache and it will give the response to the client with the requested page. If again the same web page is requested by any client then DNS server will get the web page from the DNS cache instead of again fetching the same page from the internet. With this there wont be any delay for the client to get the web page. This helps in bandwidth control. This is how the DNS server caching works.
a modem
a DTE device
What type of RJ45 UTP cable do you use to connect a PC's COM port to a router or switch console?
crossover cable
What is the command line interface used for on a cisco router?
Cisco IOS uses a command line interface (CLI) for inputting commands when configuring Cisco Routers
How switch works if you connect one of its ports to a hub?
That shouldn't cause any problem, other than increasing the number of collisions on the segment of the domain that is on the hub, which slows down the network for those computers (especially if they are both being used at once). -DJ Craig
Is a VLAN essentially a collision domain?
No- A VLAN is a single broadcast domain. If the VLAN uses a hub, which essentially connects all devices on a single wire, the the VlAN would be a collision domain. However hubs are rarely seen these days. A network switch keeps every device separated on individual collision domains so every device is kept from colliding with any other device.
process ID
How Do I Solve Custom Subnet Mask Problem 10?
.Hello everyone,
Here's my overview:
Hello everyone, I seem to have a problem with this custom subnet masking problem. Number needed usable hosts:60 Network Address:198.100.10.0 I've already figured these: Address Class:C Default Subnet Masks 255.255.255.0 Total Number Of Host Addresses:64 Number Of Usable Address:62. Cannot Figure Out: Total Number Of Subnets, Custom Subnet Masks (I got 255.255.255.240 but checked online and wasn't right). Can someone help me with this problem? Thanks.
What is the purpose of a Cisco security server agent?
Cisco Security Agent is an endpoint intrusion prevention system. It's role is to prevent any attack on your computer, As of 2011 it is no longer in production.
IPBASE
SNT coverage includes 24x7 Cisco TAC support as well as 8x5NBD hardware replacement.
How does a layer 2 switch create collision domains?
When using network switches, each port on the switch is its own collision domain.
What is the difference between dedicated networks and converged networks?
Dedicated networks for voice, video and computer data communications required a different type of device in order to access the network. Telephones, televisions, and computers used specific technologies and different dedicated network structures, to communicate.
Converged networks are capable of delivering voice, video and data services over the same communication channel or network structure.
How do you disable console user name and password?
In global config mode go to console 0 (line console 0) and type: no login. Additionally you can type 'privilege level 15' so you will always have full privileges when using console.
How much does cisco router memory have?
Cisco router memory has over 120 gigabytes. That is a lot of memory for a router. This item can be found on either eBay or Amazon for a very cheap price.
What is the difference between switch and router?
Routers operate at layer 3 of the OSI model while switches operate at layer 2. The data transmission form of a router is called a packet while in a switch, it is called a frame. Routers are mainly used in wide area networks while switches are used in local area networks.
How many simultaneous Telnet sessions does a Cisco router support by default?
This depends on the router but I wouldn't normally (except for on a high end router) expect it to be more than 1. I would recommend looking at the manufacturers website or manual.
