Capturing WLAN Packets using WireShark

If you are studying for CCNP Wireless or CWNP Certification, an essential part of the study process is actually getting to lab it all out so as to understand the concepts. I noticed that my Wireshark output lacked the 802.11 management or control packets while trying to capture Open System Authentication process. This blog will explain … Continue reading Capturing WLAN Packets using WireShark

CWNP’s CWSP-205 Official Study Guide Book Review | Part 1

When I think of the CWNP Program, I think of actual Wireless knowledge that Vendor oriented programs have failed to deliver. I have always used CWNP books to complement information that was missing during my past CCNP Wireless exams (2 more to go). It was therefore only logical that I would turn to their CWSP book … Continue reading CWNP’s CWSP-205 Official Study Guide Book Review | Part 1

CCNP Wireless 642-747 IUWMS Summary Notes 5 : Location Tracking Techniques – Angulation (AoA / DoA)

Angulation (Angle-Based) Techniques Localization is based on the angle of the received signal. Angle of Arrival (AoA) / Direction of Arrival (DoA) AoA determines the angle of Incidence at which signals arrive at the receiving sensor. This angle is used to estimate the location of the device using the intersection of the two lines of … Continue reading CCNP Wireless 642-747 IUWMS Summary Notes 5 : Location Tracking Techniques – Angulation (AoA / DoA)

CCNP Wireless 642-747 IUWMS Summary Notes 4 : Location Tracking Techniques – Lateration (RSS)

Received Signal Strength (RSS) Localization is based on the received signal strength. The RSS is measured either by the mobile device or by the receiving sensor. The following information is needed to calculate the distance between the sensor and the device: Transmitter output power Cable losses Antenna gain Path loss model(PL) A common PL model … Continue reading CCNP Wireless 642-747 IUWMS Summary Notes 4 : Location Tracking Techniques – Lateration (RSS)

CCNP Wireless 642-747 IUWMS Summary Notes 3 : Location Tracking Techniques – Lateration (ToA and TDoA)

Distance-Based (Lateration) Techniques The tracking position is determined based on distance. The distance can be measured in three different ways: Using Time of Arrival (ToA) Using Time Difference of Arrival (TDoA) Using Received Signal Strength In ToA and TDoA, localization is based on propagation time, whereas for RSS systems, propagation is based on signal strength. … Continue reading CCNP Wireless 642-747 IUWMS Summary Notes 3 : Location Tracking Techniques – Lateration (ToA and TDoA)

CCNP Wireless 642-747 IUWMS Summary Notes 1 : Introduction to Location-Based Services

Advantages of Location-based services. Location-based services helps us to: Effectively locate assets and personnel. Improve productivity by locating effectively. Reduce unauthorized removal of assets and, thus, helps reduce losses. Improve customer satisfaction Improve WLAN planning and tuning Coordinate device location with Security policy enforcement Determine rogue device location Monitor health and status of key assets. … Continue reading CCNP Wireless 642-747 IUWMS Summary Notes 1 : Introduction to Location-Based Services

Passed CCNP CUWSS Wireless Exam, moving on to CCNP IUWMS Wireless.

Happy New Year and thank you for sticking with me thus far ! In this post, I will share my CUWSS experience. I finished studying for my CUWSS Exam in the beginning of December and booked my again for around December the 15th. My first attempt to give the exam was unsuccessful :(. To be honest, … Continue reading Passed CCNP CUWSS Wireless Exam, moving on to CCNP IUWMS Wireless.

CCNP Wireless CUWSS 642-732 Summary Notes 24 : Installation Report

Post Deployment A detailed hardware requirement list should have: Wireless equipment needed Supporting infrastructure upgrades RF Validation for the installed wireless network Co channel interference and appropriate channel separation Power levels are consistent with site survey If designing for AP failover or designing to RRM RF Coverage (band by band) Roaming audit Airmagnet can be … Continue reading CCNP Wireless CUWSS 642-732 Summary Notes 24 : Installation Report

CCNP Wireless CUWSS 642-732 Summary Notes 23 : Assessing WLAN Readiness

WLAN Readiness WCS can be used to assess Wireless coverage readiness for both Location Services and VoWLAN. This however does not replace an onsite post-deployment site survey. The tools used are: Inspect VoWLAN Readiness Inspect location Readiness Both tools are launched from the map that you are viewing on WCS. Voice over WLAN Readiness WCS … Continue reading CCNP Wireless CUWSS 642-732 Summary Notes 23 : Assessing WLAN Readiness

CCNP Wireless CUWSS 642-732 Summary Notes 22 : Assessing RF Coverage

RF Audit The main objective is to verify RF Coverage. The goal is to validate or audit the current WLAN deployment in order to enhance its security and performance. Unlike pre installation site surveys, post installation surveys focus more on the entire site environment. Verify RF footprint of all installed APs. Use Ekahau Survey or AirMagnet Survey PRO. First … Continue reading CCNP Wireless CUWSS 642-732 Summary Notes 22 : Assessing RF Coverage

CCNP Wireless CUWSS 642-732 Summary Notes 21 : Infrastructure requirements Part 2

802.11n APs with 100% duty cycle: the 2,4 band when oversubscribed with clients communicating at 144 Mbps may consume up to 70 - 75 Mbps on wired side. the 5 GHz band when oversubscribed and using 40 MHz channels with clients communicating at 300 Mbps may consume up to 160 - 170 Mbps on wired side. Both … Continue reading CCNP Wireless CUWSS 642-732 Summary Notes 21 : Infrastructure requirements Part 2

CCNP Wireless CUWSS 642-732 Summary Notes 20 : Choosing Antennas

Antennas Antenna - “an intentional radiator of electromagnetic radiation. Electromagnetic field - a sine wave that has an electric component and a magnetic field component. Indoor antennas are always vertically polarized but this is not critical. Polarization plays a role in Outdoor links where a polarization mismatch can reduce the received signal by 20 dBm. Polarization … Continue reading CCNP Wireless CUWSS 642-732 Summary Notes 20 : Choosing Antennas

CCNP Wireless CUWSS 642-732 Summary Notes 19 : Infrastructure Requirements Part 1

AP Power  Options for powering the AP AP model-specific Power module (DC Power) Power Injector - combine 48-VDC power with the data signal, sending both to the access point or bridge. The AIR-PWRINJ3 power injector for Cisco Aironet 1130AG, 1140AG, and 1240AG Series Access Points works with the power supply provided with the access point. The Cisco Aironet Power … Continue reading CCNP Wireless CUWSS 642-732 Summary Notes 19 : Infrastructure Requirements Part 1

CCNP Wireless CUWSS 642-732 Summary Notes 18 : Hardware for the RF Network

Designing the RF network Define the APs and WLC requirements AP Density This depends on: Application requirements Data Networks (web browsing) 15 to 25 users per AP 802.11b users reduce a 802.11g AP throughput dramatically. The 802.11b client still has a maximum data rate of 11 Mb/s per second and a maximum throughput of 7.1 Mb/s. Data … Continue reading CCNP Wireless CUWSS 642-732 Summary Notes 18 : Hardware for the RF Network

CCNP Wireless CUWSS 642-732 Summary Notes 17 : Ekahau Site Survey

Ekahau Site Survey Tool  This tool is used to determine each AP coverage area. It records the signal level, retries, lost packets etc. Ekahau Site Survey comes in a standard version and a Pro version. Standard Pro adds the predictive survey which allows us to add obstacles to the map so as to predict how many APs will be … Continue reading CCNP Wireless CUWSS 642-732 Summary Notes 17 : Ekahau Site Survey

CCNP Wireless CUWSS 642-732 Summary Notes 16 : Layer 2 Active Site Survey using AirMagnet Survey Pro

AirMagnet Survey Layer 2 site survey can be performed with AirMagnet Survey PRO to determine the access point placement and coverage. AirMagnet Survey PRO has the capability of doing pre-site surveys (before the install) and post-site surveys (after the install), also known as an audit, to ensure adequate coverage. In the configuration menu: Select the SSID Set the Tx … Continue reading CCNP Wireless CUWSS 642-732 Summary Notes 16 : Layer 2 Active Site Survey using AirMagnet Survey Pro