Differences between VLSM and CIDR

VLSM (Variable Length Subnet Mast) coming soon... CIDR(CLassless Inter-Domain Routing) Prefixs Using CIDR, any address range is not predifined in terms of class A,B,C,D, but instead requires a mask similar to subnet mask, called a CIDR mask. The core Internet routers must be able to interpret and process masks in addition to network numbers. This combination of numbers, called a network prefix. Routers use prefix(/) to describe how many bits are network bits. Route Aggregation Which works by joining multiple numerically adjacent IP prefixes into a single shorter prefix(called aggregation or summary) that covers more address...

Review STP protocol

STP switches send BPDUs(Bridge Protocol Data Units) to each other to form their topology databaes and forwarded to a specific MAC multicast address:0180.c200.0000. It ensures a loop-free topology, prevents broadcast storm, bridge loops, as well as act as the redundancy link in case of active link failure. Types: CSTP(802.1D) The spanning tree protocol is an early standard for preventing network loops.RSTP(802.1W) The Rapid Spanning Tree Protocol recovers(converges to a new spanning tree) more quickly than STP after a network topology change. It is backwards-compatible with and STPMSTP(802.1S) Multiple Spanning Tree Protocol: Allows...

The learning of 802.11n protection mechanisms

To ensure backward compatibilit with older 802.11a/b/g radios, an HT AP will operate in one of four protection modes:Mode 0-Greenfield mode All the HT client stations must have the same operational capabilities, include 20/40 MHz BSS and PPDU format. If in this mode, there is no protection method need to be used. Mode 1-HT Nonmenber protection mode Protection mechanisms kick in when a non-HT client station or non-HT AP is heard that is not a member of the BSS. Much like the ERP protection use Non-ERP present Mode 2-HT 20 MHz protection mode If a 20MHz only HT station associates with the 20/40 MHz AP, protection must be used. If this mode...