Networking links

This page by David Papkin shows useful network links

Enroll in Cisco Networking Academy

CCNAX 200-125 exam

Shows config and lists different syslog levels

Configuring System Message Logging (Cisco)

Configuring Cisco IOS to automatically save the running configuration to a tftp server on save

Booting Cisco Router from a TFTP server

Use of the Configuration Register on All Cisco Routers

Understanding Cisco Auto Archive Feature to Backup Configuration File

Adjust Administrative Distance for Route Selection in Cisco IOS Routers

Interface and Line Numbers in Cisco Routers

Configuring Link aggregation with Etherchannel

Errdisable Port State Recovery on the Cisco IOS Platforms

Maximum Number of Interfaces and Subinterfaces for Cisco IOS Routers: IDB Limits



Cisco IP Addressing: DHCP Configuration Guide

DHCP Static Binding on Cisco IOS


Cisco Campus Network for High Availability Design Guide

Cisco What Is Administrative Distance?

Network Management tools

Network Performance Monitor (NPM) Multi-vendor network monitoring that scales and expands with the needs of your network
Paessler Router Traffic Grapher (PRTG) Monitor all the systems, devices, traffic, and applications in your IT infrastructure.
ManageEngine OpManager  Monitor routers, switches, firewalls, servers, and VMs for fault and performance
WhatsUp Gold provides complete visibility into the status and performance of applications, network devices and servers in the cloud or on-premises.
Cisco Network Assistant  simplifies wired and wireless network management for networks up to 80 devices with its intuitive GUI and a task-based menu


Protocol and Port(s) Used UDP: 1812 & 1813
-or- UDP: 1645 & 1646
TCP: 49
Encryption Encrypts only the Password Field Encrypts the entire payload

TACACS+ and RADIUS Comparison (Cisco)



Understanding BGP

What is OSPF cost

Adjust Administrative Distance for Route Selection in Cisco IOS Routers

eBGP ASN numbers


How to Configure SNMP

How to Configure SNMP Community Strings


STP Root Port Selection

stp root port selection

Spanning Tree Protocol WIKI

Spanning Tree Protocol Operation



Creating Ethernet VLANs on Catalyst Switches

Configure InterVLAN Routing on Layer 3 Switches


Current Standards for CAT Patch Cords
Bulk Patch Cord
  • Cat 1: Wiring used in POTS telephone communications, ISDN and wiring for doorbells. Not recognized by TIA/EIA
  • Cat2: Was used on a 4 Mbit/s token ring networks. Not recognized by TIA/EIA
  • Cat3: Typically used on 10 Mbit/s Ethernet networks and can be used up to 16 MHz. Currently recognized by TIA/EIA
  • Cat4: Typically used on 16 Mbit/s token ring networks and can be used up to 20 MHz. Not recognized by TIA/EIA
  • Cat5: Typically used on 100 Mbit/s Ethernet networks and can be used up to 100 MHz; however, Cat5 is not suitable for 1000BASE-T gigabit Ethernet. Not recognized by TIA/EIA
  • Cat5e: Typically used on 100 Mbit/s Ethernet networks and gigabit Ethernet networks; can be used up to 100 MHz. Currently recognized by TIA/EIA
  • Cat6: Performs at more than double the MHz of Cat5 and Cat5e, going up to 250 MHz. Currently recognized by TIA/EIA
  • Cat6a: Standard for future 10 Gbit/s applications.
  • Cat7: Standard used to describe ISO/IEC 11801 Class F cabling. Cat7 is a protective shield covering 4 individually shielded pairs (STP) for transmission of frequencies of up to 600 MHz


Differences between T568A and T568B explained

Power over Ethernet (POE) pinout

Switch Virtualization

Troubleshooting Switch Stacks

Cisco StackWise and StackWise Plus Technology


How do SNMP, MIBs and OIDs work?


Configure IP address on Cisco router

Configure Cisco switch settings


Microsoft IPv6 Addresses

Configuring IPv6

End of David Papkin page on Networking links.

David Papkin favorite movies

Robert Deniro in GoodFellas

Ava Gardner in Singapore (Flim Noir)

Clarke Gable in China Seas