Module 1: Basic Device Configuration

Vocabulary flashcards covering Cisco CCNA switch configuration, LEDs, crash recovery, interface troubleshooting, SSH configuration, and IPv4/IPv6 verification based on the lecture transcript.

POST (Power-On Self-Test)

The initial step in the switch power-on process that tests the CPU, the RAM, and the portion of flash memory holding the file system.

Bootloader

A small program stored in ROM that runs right after POST to perform low-level CPU initialization, initialize the flash file system, and locate/load the default iOS operating system.

boot system

The main command used to specify the exact path and storage location of the iOS file (.bin file) that the switch should load into memory.

SYST LED

The System LED on a Cisco switch that indicates whether the switch is powered on and functioning properly.

RPS LED

The Redundant Power Supply LED on a switch that displays the status of an attached external redundant power supply.

Mode Button

A button located on the front of the switch used to toggle between STAT, DUPLEX, SPEED, and PoE status mode indicators.

Switch Recovery Timeframe

The period within 15 seconds after reconnecting power to a crashing switch when the mode button must be pressed and held to enter recovery mode.

Switch Virtual Interface (SVI)

A logical layer 3 interface assigned to a specific VLAN on a switch to enable remote IP management.

VLAN 1

The default management VLAN interface to which all switch ports are assigned out of the box.

Full Duplex

A bi-directional transmission mode that allows data to be sent and received simultaneously.

Half Duplex

A uni-directional transmission mode where data can only be sent or received at one time, not both.

Auto MDI-X

A switch feature that automatically detects the required copper cable connection type (straight-through or crossover) and configures the port internal connections accordingly.

Runt

A frame discarded by an interface because its length is smaller than the minimum allowable packet size of 64 bytes.

Giant

A frame discarded by an interface because its length exceeds the standard maximum size of 1,518 bytes.

CRC Error

An error counted on an interface when the calculated checksum does not match the frame checksum sent by the source.

Late Collision

A frame collision that takes place after the first 512 bits of a frame have been transmitted.

Telnet

An unencrypted remote access protocol that operates on port 23 and transmits data in clear plain text.

SSH (Secure Shell)

A secure remote management protocol operating on port 22 that encrypts session traffic and user authentication.

k9 (iOS Designation)

A designation string within a Cisco iOS file name indicating that the operating system image supports cryptographic and encryption functionality.

Loopback Interface

A virtual software interface internal to a router that is not tied to any physical port and remains continuously in an up/on state.

FE80 (IPv6)

The standard prefix identifying an IPv6 link-local address, used for single-segment network communications.

Local Host Route

A routing table entry designated with 'L' that represents the specific IP assigned to a router interface, having a /32 prefix for IPv4 or a /128 prefix for IPv6.