Term
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Definition
| The Cisco IOS (Internetwork Operating System) is copied into RAM during bootup. |
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Term
| Running Configuration File: |
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Definition
| This is the configuration file that stores the configuration commands that the router IOS is currently using. With few exceptions, all commands configured on the router are stored in the running configuration file, known as running-config. |
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Term
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Definition
| This file stores information about directly connected and remote networks. It is used to determine the best path to forward the packet. |
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Term
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Definition
| This cache contains the IPv4 address to MAC address mappings, similar to the ARP cache on a PC. The ARP cache is used on routers that have LAN interfaces such as Ethernet interfaces. |
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Term
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Definition
| Packets are temporarily stored in a buffer when received on an interface or before they exit an interface. |
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Term
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Definition
| is volatile memory and loses its content when the router is powered down or restarted. |
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Term
ROM is a form of permanent storage.
Uses in Cisco devices: |
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Definition
- The bootstrap instructions
- Basic diagnostic software
- Scaled-down version of IOS |
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Term
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Definition
| Used by ROM, is software that is embedded inside the integrated circuit. Includes the software that does not normally need to be modified or upgraded, such as the boot instructions. |
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Term
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Definition
| Nonvolatile computer memory that can be electrically stored and erased. Used as permanent storage for the operating system, Cisco IOS. |
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Term
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Definition
| All configuration changes are stored in the running-config file in RAM. Tos save those changes in case the router is restarted or loses power, the running-config must be copied to this location |
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Term
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Definition
Manages the hardware and software resources of the router, including memory allocation, processes, security, and file systems.
Is a multitasking operating system that is integrated with routing, switching, internetworking, and telecommunications functions. |
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Term
| Four major phases to the bootup process: |
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Definition
1. Performing the POST (Power-On Self Test)
2. Loading the bootstrap program
3. Locating and loading Cisco IOS
4. Locating and Loading the Configuration File |
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Term
IOS version
Cisco Internetwork Operating System Software
IOS (tm) C2600 Software (C2600-I-M), Version 12.2(28), RELEASE SOFTWARE (fc5) |
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Definition
| This is the version of the Cisco IOS software in RAM and that is being used by the router. |
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Term
ROM Bootstrap Program
ROM: System Bootstrap, Version 12.1(3r)T2, RELEASE SOFTWARE (fc1) |
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Definition
| This shows the version of the system bootstrap software, stored in ROM memory, that was initially used to boot up the router. |
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Term
CPU and Amount of RAM
cisco 2621 (MPC860) processor (revision 0x200) with 60416K/5120K bytes of memory |
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Definition
| The first part of this line displays the type of CPU on this router. The last part of this line displays the amount of DRAM. |
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Term
Interfaces
2 FastEthernet/IEEE 802.3 interface(s)
2 Low-speed serial(sync/async) network interface(s) |
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Definition
This section of the output displays the physical interfaces on the router. In this example, the Cisco 2621 router has two FastEthernet interfaces and two low-speed serial interfaces. |
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Term
Amount of NVRAM
32K bytes of non-volatile configuration memory. |
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Definition
This is the amount of NVRAM on the router. NVRAM is used to store the startup-config file. |
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Term
Amount of Flash
16384K bytes of processor board System flash (Read/Write) |
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Definition
This is the amount of flash memory on the router. Flash is used to permanently store the Cisco IOS.
Note: It may be necessary to upgrade the amount of flash when upgrading the IOS. |
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Term
Configuration Register
Configuration register is 0x2102 |
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Definition
The last line of the show version command displays the current configured value of the software configuration register in hexadecimal. If there is a second value displayed in parentheses, it denotes the configuration register value that will be used during the next reload.
The configuration register has several uses, including password recovery. The factory default setting for the configuration register is 0x2102. This value indicates that the router will attempt to load a Cisco IOS software image from flash memory and load the startup configuration file from NVRAM. |
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Term
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Definition
| On Cisco routers refers to a physical connector or the router whose main purpose is to receive and forward packets. |
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