CCNA Wireless Summary Notes: Understanding 802.11 Frame Types

Switches do not actively participate in the exchange of frames. The APs however are active participants. a client must join or associate  with a specific wireless network by first getting permission from the AP. Then the client must send and receive every frame through the AP or coordinate with the AP for direct  client-to-client communication to … Continue reading CCNA Wireless Summary Notes: Understanding 802.11 Frame Types

CCNA Wireless Summary Notes: Planning Coverage with Wireless APs

AP Cell Size is known as the Basic Service Area. Cell size can be controlled by changing the following parameters: AP Transmit power (Increase signal strength of AP). Most APs are set to transmit within government regulations which limit the effective isotropic radiated  power (EIRP) to a maximum transmit power level of 20 dBm (100 mW). … Continue reading CCNA Wireless Summary Notes: Planning Coverage with Wireless APs

CCNA Wireless Summary Notes: Understanding Autonomous APs

APs bridge wireless data from the air to normal wired network. Autonomous APs have both wired and wireless hardware so that wireless client associations can be locally terminated onto a wired connection. the AP is in charge of  mapping a service set identifier (SSID) to a VLAN, or in 802.11 terms, mapping a basic service set (BSS) … Continue reading CCNA Wireless Summary Notes: Understanding Autonomous APs

CCNA Wireless Summary Notes: Understanding the CUWN Architecture

AP traffic is divided into the following: Data Plane traffic - end user traffic Control Plane traffic - control, configure, manage, and monitor the AP Recall that autonomous APs bridge traffic between a wireless BSS and a wired VLAN. An Autonomous AP performs the following combined functions Lightweight AP functions (Real Time functions) RF Transmit/Receive MAC … Continue reading CCNA Wireless Summary Notes: Understanding the CUWN Architecture

CCNA Wireless Summary Notes: Initial Controller Configuration

For WLC ports and interfaces refer to different concepts. Controller ports are physical connections made to an external switched network, whereas interfaces are logical connections made internally within the controller. Port types: Service port - OOBM, system recovery, initial boot. Connects using Access port only. Distribution system port - For AP and management traffic, Client data. Usually a … Continue reading CCNA Wireless Summary Notes: Initial Controller Configuration

CCNA Wireless Summary Notes: Understanding Controller Discovery

Process of discovering a controller AP state machine (sequence of states that the AP undergoes following bootup) AP boots on a small IOS, gets IP via DHCP and communicates through the network. AP tries to discovertheWLC. Discovery methods in order of sequence followed Local subnet broadcast. AP sends a unicast CAPWAP Discovery Request or broadcast … Continue reading CCNA Wireless Summary Notes: Understanding Controller Discovery

CCNA Wireless Summary Notes: Understanding Roaming

Roaming with Autonomous APs Moving from one autonomous AP  to another autonomous AP Intracontroller Roaming: Moving from one lightweight AP that is connected to a WLC to another AP that is connected to the same WLC. Controller updates its client association table Takes less than 10 ms Client has no knowledge of what is happening. … Continue reading CCNA Wireless Summary Notes: Understanding Roaming

CCNA Wireless Summary Notes: Understanding Radio Resource Management (RRM)

Data Rates Initial IEEE requirements are as follows - which are configured by default on WLC: For 2.4 GHz, the 1-, 2-, 5.5-,and 11-Mbps rates are all marked as mandatory ( Must sopport all possible modulations in 802.1b) For 5-GHz band, the 6-, 12-, and 24-Mbps rates are marked as mandatory Enable 802.11a - 5GHz Enable 802.11b - … Continue reading CCNA Wireless Summary Notes: Understanding Radio Resource Management (RRM)

CCNA Wireless Summary Notes: Wireless Security Fundamentals – Part 2

Wireless Privacy and Integrity Methods WEP deprecated Temporal Key Integrity Protocol (TKIP) Developed by 802.11i working group and the Wi-Fi Alliance Adds following features to legacy hardware with WEP MIC — Algorithm that adds a hash value to each frame as a message integrity check to prevent tamperin Time stamp —Added into the MIC to prevent replay … Continue reading CCNA Wireless Summary Notes: Wireless Security Fundamentals – Part 2