Denial-of-Service (DoS) Attack

Denial-of-Service •Commonly used against information stores like web sites •Simple and usually quite effective •Does not pose a direct threat to sensitive data •The attacker tries to prevent a service from being used and making that service unavailable to legitimate users •Attackers typically go for high visibility targets such as the web server, or for infrastructure targets like routers and...

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Modern Network Security Threats

Major Concepts: •Rationale for network security •Data confidentiality, integrity, availability •Risks, threats, vulnerabilities and countermeasures •Methodology of a structured attack •Security model (McCumber cube) •Security policies, standards and guidelines •Selecting and implementing countermeasures •Network security design What is Network Security? National Security Telecommunications...

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TCP/IP Networking Basics & IP Address

Basic Router ConceptsLarge amounts of bandwidth can be provided easily and relatively inexpensively in a local area network (LAN). However, providing high bandwidth between a local network and the Internet can be very expensive. Because of this expense, Internet access is usually provided by a slower-speed wide-area network (WAN) link such as a cable or DSL modem. For the WAN link to work on the Internet, the data traffic meant for the Internet needs to be separated from other WAN data and forwarded....

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BGP (The Border Gateway Protocol)

The Border Gateway Protocol (BGP) is the protocol backing the core routing decisions on the Internet. It maintains a table of IP networks or 'prefixes' which designate network reachability among autonomous systems (AS). It is described as a path vector protocol. BGP does not use traditional Interior Gateway Protocol (IGP) metrics, but makes routing decisions based on path, network policies and/or rulesets. For this reason, it is more appropriately termed a reachability protocol rather than routing...

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EIGRP (Enhanced Interior Gateway Routing Protocol)

Enhanced Interior Gateway Routing Protocol - (EIGRP) is a Cisco proprietary routing protocol loosely based on their original IGRP. EIGRP is an advanced distance-vector routing protocol, with optimizations to minimize both the routing instability incurred after topology changes, as well as the use of bandwidth and processing power in the router. Routers that support EIGRP will automatically redistribute...

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Static Routing Tutorial

In studying for your CCNA exam and preparing to earn this valuable certification, you may be tempted to spend little time studying static routing and head right for the more exciting dynamic routing protocols like RIP, EIGRP, and OSPF.This is an understandable mistake, but still a mistake. Static routing is not complicated, but it’s an important topic on the CCNA exam and a valuable skill for real-world networking.To create static routes on a Cisco router, you use the ip route command followed...

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The Differences Between Hubs, Switches and Routers

Some technicians have a tendency to use the terms routers, hubs and switches interchangeably. One minute they're talking about a switch. Two minutes later they're discussing router settings. Throughout all of this, though, they're still looking at only the one box. Ever wonder what the difference is among these boxes? The functions of the three devices are all quite different from one another, even if at times they are all integrated into a single device. Which one do you use when? Let's take a...

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