Cisco Show Version Command

Show version: Displays information about the router’s internal components, including the IOS version, memory, configuration register information, etc. The most common use of the show version command is to determine which version of the Cisco IOS a device is running.…
Cisco Show Stacks Command

Show stacks is an exec command that is commonly used to diagnose system crash situations. The first section of this command’s output displays stack utilization of processes and interrupt routines, and the reason for the last system reboot. When a system…
Quiz Questions to Know Wireless LANs

Do You Know This Wireless LANs? Wireless LAN Concepts, Deploying WLANs, Wireless LAN Security. There are 9 quiz questions to know the key points of WLAN. Questions 1-4: Wireless LAN Concepts Questions 5-7: Deploying WLANs Questions 8-9: Wireless LAN Security…
OSPFv3 vs. OSPFv2 Routing Protocol

This article outlines few comparisons of OSPFv3 and OSPFv2 Routing Protocol. OSPFv3 has few similarities with that of IPv4 version i.e. OSPFv2 in some ways, like Packet Type, Interface Type, Neighbor Discovery Pattern, LSA flooding & aging. OSPFv3 and v2…
How to Troubleshoot OSPFv3 Frame-Relay?

Open Shortest Path First (OSPFv3) is a link state protocol that supports IPv6 and as well as IPv4. OSPF version 3 differs from OSPF version 2 for IPv4 as some changes have been incorporated to facilitate IPv6. This article demonstrates how…
Conditional Route Origination in OSPF Domain

Cisco device uses “default-information originate” statement to generate a default route in OSPF domain. There are two ways to originate default route by using this command: 1) When you configure “default-information originate”  under OSPF process  without any argument after this statement, OSPF process…
EIGRP on a Cisco ASA Firewall Configuration

The Cisco Adaptive Security Appliance is an integrated security equipment that can perform a variety of functions like firewall, intrusion prevention, VPN, content security, unified communications, and remote access. Among these functions, the ASA can also perform routing using popular…
Switchport Security & Configuration

One of the most overlooked security areas is the configuration of individual switchport security configuration. The reason may be that it requires a more granular configuration; this is because a typical configuration requires the knowledge of the specific MAC address(es)…
NAC Appliances: Shortcut to Access Control

To share a article about NAC Appliances From http://searchnetworking.techtarget.com/feature/NAC-appliances-Shortcut-to-access-control Infrastructures that check endpoint health before network access have generated plenty of buzz, but precious little deployment. Some companies are waiting for a winner to emerge from the chief contenders: Cisco’s Network Admission…
Is Cisco Bothering With “Open” EIGRP?

EIGRP is an example of an Interior Gateway Protocol (IGP), which is a network routing protocol that routers use to exchange routing information within an autonomous system (AS). EIGRP takes its place alongside other frequently-encountered IGPs such as Routing Information…
When Do You Use Static Routes?

Every router must have a route to know where to send traffic. We compare this to the post office’s predetermined ways to route your postal mail to its destination. When a router receives a packet from the LAN or the…
Understanding Different Router Numbers

Many of the routing protocols implemented in Cisco’s IOS require a number to follow the command that enables the routing protocol in question. For example: “router eigrp 1,” “router bgp 1” or “router ospf 1”. If you’re new to routing,…
Routing Information Protocol & RIP Configuration

Introduction to Routing Information Protocol (RIP) IP RIP (Routing Information Protocol) comes in two different versions: 1 and 2. Version 1 is a distance vector protocol (RFC 1058) and Version 2 is a hybrid protocol (RFCs 1721 and 1722). Routing Information Protocol Version 1…