CCNAResources

Cisco Certified Network Associate (CCNA) Certification summary: CCNA validates the ability to install, configure, operate, and troubleshoot medium-size route and switched networks, including implementation and verification of connections to remote sites in a WAN. CCNA curriculum includes basic mitigation of security threats, introduction to wireless networking concepts and terminology, and performance-based skills. This new curriculum also includes (but is not limited to) the use of these... Read Full Story

You would want to connect a PC to the console port.   Power cycle the router, break the boot sequence, and modify the configuration register. Here is a video tutorial to walk you through it: Here is the link for the password recovery process from Cisco: http://www.ciscosystems.com/en/US/products/sw/iosswrel/ps1831/products_tech_note09186a00801746e6.shtml Select the model you are doing password recovery for, and it will give the exact steps. Password recovery is an important skill for the real... Read Full Story

by Chris Bloomfield What is GNS3 I hear you cry? Well, imho, it is the best tool on the market to practice router configuration without having an actual router in front of you. What sets it apart is that it is a Cisco IOS emulator, not one of those nasty simulators that constrain the commands that can be used. The caveat is that you will need a Cisco IOS, for example I use the 3660 Crypto IOS. I have a support contract with Cisco so I can access an IOS however if you look around enough you... Read Full Story

Streamlined IPv6 Header The IPv6 header has a new format that is designed to keep header overhead to a minimum. This format is achieved by moving both nonessential fields and option fields to extension headers that are placed after the IPv6 header. The streamlined IPv6 header provides more efficient processing at intermediate routers. Stateless and Stateful Configuration IPv6 supports both stateful and stateless address configurations. IPv6 will work with or without a DHCP server. With... Read Full Story

VLSM - Variable Length Subnet Masking. Several new methods of addressing were created so that usage of IP space was more efficient. The first of these methods is called Variable-Length Subnet Masking (VLSM). Subnetting had long been a way to better utilize address space. Subnets divide a single network into smaller pieces. This is done by taking bits from the host portion of the address to use in the creation of a “sub” network. For example, take the class B network 147.208.0.0. The default... Read Full Story

Classful * Classful routing protocols strictly follow the subnet masks i-e. for Class A (8-bit prefix or /8), B (16-bit prefix or /16), and C (24-bit prefix or /24). * Do not carry subnet mask information on their routing updates. This makes them unsuitable for hierarchical addressing that require Variable Length Subnet Mask (VLSM) and discontiguous network. * All devices in the network must use the same subnet mask therefore when running a classful routing protocol on a network, make sure... Read Full Story

  Read Full Story

Bridge groups provide a method to group two or more ports into a single broadcast domain, where as VLAN provide a method to group many ports into a single broadcast domain or establish a number of broadcast domains (or secure groups) on a single switch. Bridge groups operate at layer 2. So they are not very effective at connecting layer 3 switches and routers. If you want to connect 2 ports of a layer 2 switch with 2 Ethernet interfaces of a router you can do that but the Ethernet interfaces... Read Full Story

In Cisco IOS, EXEC mode commands cannot be run from the Global Configuration mode or in any other configuration mode. This means, everytime an admin makes a change from the configuration mode (Global Config) then you have to "end" or "Ctrl+Z" back to the EXEC mode and run the EXEC commands like "show", "clear" and "debug" commands.With the "do" command thats a thing of the past. The "do" command can be used to run any EXEC commands from within Global Configuration mode or any other... Read Full Story

Question 1: What is the first valid host on the subnetwork that the node 172.20.182.215 255.255.255.128 belongs to? Answer: 172.20.182.129 Question 2: Which subnet does host 172.21.112.211/23 belong to? 172.21.112.0 Question 3: What is the first valid host on the subnetwork that the node 10.245.110.177/20 belongs to? Answer: 10.245.96.1 Question 4: What is the broadcast address of the network 172.16.144.0 255.255.248.0? Answer: 172.16.151.255 Question 5: Which subnet does host 192.168.210.125... Read Full Story