Data networks, including the Internet, are responsible for supplying reliable, transparent communication for people and applications. Data from applications such as e-mail, web browsers and instant messaging is packaged, transported and delivered... Learn More>>
Standard and extended Cisco IOS access control lists (ACLs) can be used to classify IP packets. Using ACLs, you can apply a number of features to the classified packets, such as encryption, policy-based routing, quality of service (QoS), Network... Learn More>>
After physical access has been secured, there is growing need to ensure that access to the switch via the console port and the vty ports is secure. In addition, it is important to ensure that unused switch ports do not become a security... Learn More>>
When sites are located at different geographic locations, a WAN provides interconnections between the sites. There are several types of WANs, including point-to-point leased lines, circuit-switched networks, and packet-switched networks, which are discussed in this... Learn More>>
The network staff is responsible for ensuring that the underlying communications infrastructure is capable of supporting business objectives and associated applications. Network staff is also responsible for managing each device on the network according... Learn More>>
Subnetworks, also known as subnets, are very common in all but the smallest of network environments. Subnetworks segment the network into smaller divisions that have their own addresses. Each host is represented by a unique IP address, which can be represented in either... Learn More>>
Routing is the process by which information moves from one location to another. Routers gather and maintain routing information to enable the transmission and receipt of these data packets. Routing information takes the form of entries in a... Learn More>>
Two Internet scalability challenges are the depletion of registered IP version 4 (IPv4) address space and scaling in routing. Network Address Translation (NAT) and Port Address Translation (PAT) are mechanisms for conserving registered IPv4... Learn More>>
Enhanced Interior Gateway Routing Protocol (EIGRP) is an advanced distance vector routing protocol that was developed by Cisco. EIGRP is suited for many different topologies and media. In a well-designed network, EIGRP scales well and provides extremely quick... Learn More>>
Access control is very important within any organization and once you understand the uses of Access Control Lists (ACLs), you can determine how to implement them on your Cisco network. Using ACLs, you can apply a number of features to the classified packets,... Learn More>>
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