Extending the Network into the WAN WANs are most often charge-for-service networks, providing the means for users to access resources across a wide geographic area. Some services are considered Layer 2 connections between your remote locations, typically provided by a telephone company (telco) over its WAN switches. Some of these technologies include a serial point-to-point … [Read more...]
Introducing VPN Solutions
Introducing VPN Solutions Cisco VPN solutions provide an Internet-based WAN infrastructure for connecting branch offices, home offices, business partner sites, and remote telecommuters to all or portions of a company network. With cost-effective, high-bandwidth Internet connectivity that is secured by encrypted VPN tunnels, you can reduce WAN bandwidth costs while increasing … [Read more...]
Managing Address Spaces with NAT and IPv6
Managing Address Spaces with NAT and IPv6 Transitioning to IPv6 The ability to scale networks for future demands requires a limitless supply of IP addresses and improved mobility. IP version 6 (IPv6) satisfies the increasingly complex requirements of hierarchical addressing that IP version 4 (IPv4) does not provide. IPv6 uses some different address types that make IPv6 more … [Read more...]
Scaling the Network with NAT and PAT
Scaling the Network with NAT and PAT Two Internet scalability challenges are the depletion of registered IP version 4 (IPv4) address space and scaling in routing. Cisco IOS Network Address Translation (NAT) and Port Address Translation (PAT) are mechanisms for conserving registered IPv4 addresses in large networks and simplifying IPv4 address management tasks. NAT and PAT … [Read more...]
Troubleshooting ACLs
Troubleshooting ACLs When you finish the ACL configuration, use the show commands to verify the configuration. Use the show access-lists command to display the contents of all ACLs, as demonstrated in Example 6-13. By entering the ACL name or number as an option for this command, you can display a specific ACL. To display only the contents of all IP ACLs, use the show ip … [Read more...]
Configuring ACLs
Configuring ACLs This section describes the steps to configure named and numbered, standard and extended ACLs. This section also explains how to verify that the ACLs function properly and discusses some common configuration errors to avoid. Standard IPv4 ACLs, numbered 1 to 99 and 1300 to 1999 or named, filter packets based on a source address and mask, and they permit or … [Read more...]
Access Control List Operation
Access Control List Operation Understanding the uses of access control lists (ACL) enables you to determine how to implement them on your Cisco network. ACLs can provide an important network security feature and filter packets on inbound and outbound router interfaces. This section describes some of the applications for ACLs on Cisco networks, identifies the different types of … [Read more...]
Troubleshooting EIGRP
Troubleshooting EIGRP As an advanced distance vector routing protocol, EIGRP scales well with a growing network. However, this scalability introduces complexity in design, configuration, and maintenance. This section introduces some of the common issues surrounding an EIGRP network and a flowchart approach to troubleshooting these issues. Components of Troubleshooting … [Read more...]
Implementing EIGRP
Implementing EIGRP EIGRP is an advanced distance vector routing protocol developed by Cisco. EIGRP is suited for many different topologies and media. In a well-designed network, EIGRP scales well and provides extremely quick convergence times with minimal overhead. EIGRP is a popular choice for a routing protocol on Cisco devices. Introducing EIGRP EIGRP is a … [Read more...]
Troubleshooting OSPF
Troubleshooting OSPF Because it is a link-state routing protocol, OSPF scales well with a growing network. But this scalability introduces complexity in design, configuration, and maintenance. This section introduces some of the common issues surrounding an OSPF network and offers a flowchart approach to troubleshooting these issues. Components of Troubleshooting … [Read more...]