CCNA 7.5.b: Password recovery and configuration register

Overview: Password recovery is the process used to recover the enable password on a router.  Configuration register can be used to change router behavior in different ways, but usually it’s to specify how it boots up.   Study Notes: Password recovery procedures can be used to recover the enable password if it is unencrypted in […]

CCNA 7.5.a: Cisco IOS upgrades and recovery (SCP, FTP, TFTP, and MD5 verify)

Overview: TFTP, FTP and SCP are protocols that can be used to upgrade and recover Cisco IOS images. Study Notes: Several protocols are available to copy the Cisco IOS image into a Cisco router. The most commonly used protocol is TFTP Other protocols include SCP and FTP MD5 is a way to verify the integrity […]

CCNA 7.4: Configure and verify initial device configuration

Overview: Initial device configuration is necessary when first powering on a new router or switch.  It can be accomplished through the System Configuration Dialog guide or manually.   Study Notes: When powering on a new device, the System Configuration Dialog will prompt you to continue with initial device configuration.  Enter yes to continue being prompted […]

CCNA 7.3.f: Loopback

Overview: A loopback interface is a logical, virtual interface that is always up   Study Notes: A loopback interface is a logical, virtual interface A loopback interface is always up/up once configured A loopback interface can be used to emulate a physical interface Any IP address can be assigned to a loopback interface Typically, a […]

CCNA 7.3.e: Timezone

Overview: When setting the correct time on a router, the first step is configuring the proper timezone   Study Notes: By default, the timezone is UTC Configuring the correct time and timezone on a router are good practices for the following reasons Troubleshooting is simplified when log files display the correct time Multiple devices configured […]

CCNA 7.3.d: Logging

Overview: Logging is essential to gaining visibility into your network   Study Notes: By default, system logging  is enabled to the console at the debugging level Log messages are displayed in this format Seq_no:timestamp: %facility-severity-MNEMONIC:description For example: 000052: Jan 20 08:50:18: %SYS-5-CONFIG_I: Configured from console by vty2 (172.16.0.25) Five types of logging Console logging – […]

CCNA 7.3.b: Using Cisco Discovery Protocol or LLDP for device discovery

Overview: CDP or LLDP can be used to discover details about neighboring devices   Study Notes: CDP is covered in-depth in section 2.8.a: CDP LLDP is covered in-depth in section 2.8.b: LLDP To use CDP to discover neighboring devices, CDP must be enabled on both devices for neighbor information to be exchanged CDP is enabled […]

CCNA 7.3.a: Backup and restore device configuration

Overview: Backing up device configurations is good practice and can save a lot of downtime should a device need to be upgraded or swapped out.   Study Notes: There are multiple ways to backup and restore configurations.  TFTP and FTP are covered below.   Use a TFTP server to backup a router configuration Start the […]

CCNA 7.1.c: Syslog

Overview: Syslog is a way for network devices to send event messages to a logging server, usually known as a Syslog server.   Study Notes: Syslog – System Message Logging Syslog uses port 514 Controls the distribution of logging messages to various destinations based on the configuraiton Logging buffer Terminal lines Syslog server When disabled, […]

CCNA 7.1.a: SNMPv2

Overview: SNMPv2 improves upon the limitations in SNMPv1   Study Notes: SNMPv2 improves upon SNMPv1 (SNMPv1 was criticized for poor security) SNMPv2 includes these improvements Performance – GetBulkRequest in addition to the iterative GetNextRequest Security – party-based security system (obsoleted later due to complexity) Confidentiality Manager-to-manager communications SNMPv2 still uses the less secure community-string The […]

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