CCNA, CCNA Exam, CCNA help, Cisco Certified Network Associate, CCNA study, CCNA prep

Category: CCNA 200-125

CCNA 7.3.c: Licensing

Overview: Licensing refers to the IOS feature sets authorized to run on the device   Study Notes: Today, there are two major versions of IOS images: 12 and 15 IOS version 12 has eight different feature sets to choose from depending on the services you choose to run on your device FEATURE SET SERVICES IP […]

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 section 2.8.a: CDP LLDP is covered in-depth 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 To use LLDP to discover […]

CCNA 7.2: Troubleshoot network connectivity issues using ICMP echo-based IP SLA

Overview: The ICMP Echo operation measures end-to-end response time between a Cisco router and any devices using IP   Study Notes: The ICMP Echo operation measures end-to-end response time between a Cisco router and a device using IP ICMP Echo is useful for troubleshooting network connectivity issues An IP SLA (Service Level Agreement) is configured […]

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.b: SNMPv3

Overview: SNMPv3 contains significant changes to SNMPv2 including options for message integrity, authentication and encryption   Study Notes: SNMPv3 does not use community-strings SNMPv3 provides message integrity, authentication, encryption Security model (Auth) is an authentication strategy for groups and users within those groups Security level (Priv) is the permitted level of security within a security […]

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 […]

CCNA 6.6: Describe device security using AAA with TACACS+ and RADIUS

Overview: A device can be secured by using AAA with TACACS+, RADIUS or a combination of both.  The use of TACACS+ and/or RADIUS allows a client to be authenticated against a remote server versus local authentication on the device.   Study Notes: AAA AAA Authentication, Authorization, Accounting Access control is the way you control who […]