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9 Cards in this Set
- Front
- Back
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WiFi problem |
Press Fn key + Wifi button, or standalone button near Keyboard |
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Device communication |
Devices communicate via wired + wireless Ethernet, Bluetooth, + cellular WAN connections |
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WiFi data rates + frequencies |
Version 802.11a Max data rate 54 Mbps Frequency 5GHz Version 802.11b Max data rate 11 Mbps Frequency 2.4GHz Version 802.11g Max data rate 54 Mbps Frequency 2.4GHz Version 802.11n Max data rate 300/600 Mbps Frequency 5 and/or 2.4GHz Version 802.11ac Max data rate 1.7 Gbps Frequency 5GHz 2.4 GHz channels: 1-11 5 GHz channels: 36, 40, 44, 48, 149, 153, 157, 161, 165. |
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Ad Hoc Mode v Infrastructure Mode |
Ad hoc mode networks are suited for small groups of computers. Wireless networks running in Infrastructure Mode use one or more WAPs to connect the wireless network nodes to a wired network segment. |
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Wireless Encryption Types |
Wired Equivalent Privacy (WEP) - WEP encryption uses a standard 40-bit encryption to scramble data packets. Wi-Fi Protected Access (WPA) uses the Temporal Key Integrity Protocol (TKIP), which provides a new encryption key for every sent packet. This protects WPA from many of the attacks that make WEP vulnerable. Wi-Fi Protected Access 2 (WPA2) - Windows support the full IEEE 802.11i standard, also known as WPA2, to lock down wireless networks. WPA2 uses the Advanced Encryption Standard (AES) to provide a secure wireless environment. |
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Troubleshooting |
Speed - depending on the standard used, wireless throughput speeds decrease. Another factor affecting speed is the distance between wireless nodes. Interference caused by solid objects + other wireless devices operating in the same frequency range can reduce speed + range. |
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Terminal Access Controller Access-Control System (TACACS) |
TACACS has no encryption, uses TCP or UDP, + only handles authentication. TACACS+ is fully encrypted, uses only TCP, and can handle authentication, authorising users to access specific resources, + keeping track the resources used. |
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Unavailable Resources |
Can you get to another Website? Can you Ping the site? Probably a DNS problem ipconfig /flushdns Go to Network & Internet in Settings App and click Network Troubleshooter. Try using another DNS server eg 8.8.8.8 or 8.8.4.4 |
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Authentication |
Single-factor Authentication: Only using a user name + p.w. because they're both something you know. Multifactor Authentication: Requires something you have (security card), are (face + fingerprint scans), + more. |
