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11 Cards in this Set
- Front
- Back
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Switch Boot Sequence |
1. POST (Power-on Self Test) 2. Run Boot loader software 3. Boot loader performs low-LVL CPU initialization 4. Boot loader initializes the flash file system 5. Boot loader locates and loads a default IOS operating image software image into memory and passes control of the switch over to the IOS |
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Telnet |
Method for remotely accessing the CLI over a network Require active networking services and one active interface that is configured |
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Secure Shell (SSH) |
Remote login similar to Telnet but utilizes more security Stronger password authentication Uses encryption when transporting data |
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Aux Port |
Out-Of-Band connection Uses telephone line Can be used like console port |
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CSMA/CD |
Device needs to transmit It "listens" for signals on the medium Carry on listening. If it receives while sending the first 64 bytes of the frame then collision Stop sending frame, sending jam signal Wait for random time (backoff) Try again- listen for signals etc. |
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No collision |
Fully switched network with full duplex operation = no collision Higher bandwidth Ethernet does not define collisions Cable length limited if CSMA/CD needed Fibre optic- always fully switched, full duplex (Shared medium must use half duplex in order to detect collisions.) |
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MDIX Auto |
Command makes switch detect whether cable is straight through or crossover and compensate so you can use either Depends on IOS version Enabled by default from 12.2(18)SE on Disabled from 12.1(14)EA1 to 12.2(18)SE Not available in earlier versions |
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RS-232 Serial port |
Once a standard feature of a personalcomputer, used for connections to modems, printers, mice, data storage,uninterruptible power supplies, and other peripheral devices. However, RS-232is hampered by low transmission speed, large voltage swing, and large standardconnectors. Notice the two ports highlighted on theside of the laptop. The port on the left in yellow is the RS 232 Serialconnection and the port in red is a VGA connection. Take note of the pin out of both ports,the serial connection is a 9-pin while the VGA is 15 pin as well as one is amale connection and the other female. |
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Network Latency |
NIC delay- time taken to put signal on medium and to interpret it on receipt.
Latency from intermediate devices e.g. switch or router. Depends on number and type of devices. Routers add more latency than switches |
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Port Based Buffering |
Each incoming port has its own queue Frame stay in buffer until outgoing port is free Frame destined for busy outgoing port can hold up all the others even if their outgoing ports for free Each incoming port has a fixed and limited amount of memory |
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Shared Memory Buffering |
All incoming frames go in a common buffer Switch maps frame to destination port and forwards it when port is free Frames do not hold each other up Flexible use of memory allows larger frames Important for asymmetric switching where some ports work faster than others |
