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    RIPv2 – Things to Remember

    Friday, July 31st, 2009

    1. The RIP process operates from UDP port 520. 2. The metric used by RIP is hop count, with 1 signifying a directly connected network of the advertising router and 16 signifying an unreachable network. 3. RIP sends periodic updates every 30 seconds minus a small random variable that prevents the updates of neighboring routers […]

    The summarization of EIGRP – BSCI

    Friday, June 12th, 2009

    The characteristics of EIGRP follow: § Hybrid routing protocol (distance vector that has link-state protocol characteristics). § Use DUAL, first proposed by E. W. Dijkstra and C. S. Scholten, to perform distributed shortest-path routing while maintaining freedom from loops at every instant. Although many researchers have contributed to the development of DUAL, the most prominent […]

    IPv6 EUI-64 interface addressing

    Sunday, June 7th, 2009

    One of IPv6’s key benefits over IPv4 is its capability for automatic interface addressing. By implementing the IEEE’s 64-bit Extended Unique Identifier (EUI-64) format, a host can automatically assign itself a unique 64-bit IPv6 interface identifier without the need for manual configuration or DHCP. This is accomplished on Ethernet interfaces by referencing the already unique […]

    5 Minutes Course – Frame Relay

    Friday, June 5th, 2009

    Frame Relay is packet switched WAN techonlogy for transporting Data across Conection oriented Virtual Circuits using Public Data Networks (PDN). its high performance alternative to overly reliable / slow X.25 Wan Protocol. it have no Error Recovery but have smart flow control (fecn becn). it can support up to T3 line (44.736 Mbps) in 1984 […]

    How to configure NAT?

    Wednesday, May 13th, 2009

    There are a number of commands that can be used to configure the different variations of NAT. Configuring Static NAT Static NAT configuration requires that each static mapping between a local, or private, address and a global, or public, address must be configured. Then, each interface needs to be identified as either an inside or […]

    Network Address Translation (NAT)

    Wednesday, May 13th, 2009

    The advantage of using private IP addresses is that it allows an organization to use private addressing in a network, and use the Internet at the same time, by implementing Network Address Translation (NAT). NAT is defined in RFC 1631 and allows a host that does not have a valid registered IP address to communicate […]

    IP Access Control List (ACL)

    Tuesday, May 12th, 2009

    Standard IP Access Control Lists Filtering logic could be configured on any router and on any of its interfaces. Cisco IOS software applies the filtering logic of an ACL either as a packet enters an interface or as it exits the interface. In other words, IOS associates an ACL with an interface, and specifically for […]

    Subneting and Summarization

    Tuesday, April 28th, 2009

    Subneting The process of extending the default subnet mask creates a counting range in the octet that the subnet was extended into, which can be used to represent subnetworks. This allows a single Class A, B, or C network to be subdivided into many smaller groups with each group, or subdivision treated as if it […]

    IP Address Classes and CIDR

    Tuesday, April 28th, 2009

    IP addresses are divided in to ‘classes’, based on the decimal value represented in the first octet. This class definition is referred to as the First Octet Rule. There are five classes of IP addresses: classes A, class B, class C, class D; and class E, but only class A, B and C addresses are […]