Understanding the Dangers of Wireless Networks Wardriving: Driving around an area looking for open networks. Hackers: People looking to steal information or simply perform malicious behavior. Employees: Companies that block Wi-Fi trying to create security, but employees create their own to enable wi-fi functionality. Wireless Security Authentication Require Username and Password May limit to specific ..
Category : CCENT
Types of Wireless Networks PAN: Personal Area Network – Wireless Mouse, Bluetooth, very short distance LAN: Local Area Network – replace or suppliment your wired LAN MAN: Metropolitan Area Network – Uses Point to Point Wireless Bridges to allow network to extend several miles. WAN: Wide Area Network – Cellular. Wireless LAN Facts Wireless ..
Configuring Speed and Duplex By default both Speed and Duplex are set to “Auto” Auto-detect Speed works every time. Auto-detect Duplex can fail if both the switch and the device are set to auto detect. DUPLEX MISMATCH: duplex mismatch discovered on FastEthernet 0/1 (not half duplex), with AccessServer Ethernet (half duplex). You will only see ..
Setting up Port Security Port security is a way to lock down what devices can plug into your switch, or how many devices can plug in. This prevents users from putting switches on their own lines. It is possible to use a specific MAC address and if a new device is plugged in, it will ..
Configuring Passwords on a Cisco Switch The first time you attempt to Telnet, you will be denied because no passwords have been set. Passwords must be set via the terminal: Sw1>enable Sw1#conf t Sw1(config)#enable password PassWord Test the new password by exiting back to User Mode, then attempt to enter Privilege mode. Sw1(config)#exit Sw1#disable Sw1>enable ..
Understanding the Physical Indicators System – System Status. As it powers on, it will blink green. Will turn solid green upon completion. RPS – Redundant Power Supply. If installed, this will glow green. STAT – Default Mode. Show status of port. On (flicker) with signal. Util – Utilization. All lights work together to show full ..
What is the Cisco IOS The Internetwork Operating System A Command-Line method of configuring ANY Cisco Device Software that is consistent through nearly all Cisco Devices Learn it once, use it many times More powerful than any graphic interface Connecting to the Cisco Switch Get a Console Cable Plug the Serial End into the back ..
The Problem with Shared CSMA/CD Carrier Sense Multiple Access / Collision Detection Hubs and Switches perform the same function, but are significantly different. Hubs send all incoming signals to all connected PCs. Hubs work at the Physical Layer, sees the signal and sends it out. Hub Speeds are very fast – Wire Speed. No difference ..
A View of Network Cards on PCs and Cisco Devices Cable Thin Net Would tap into a baseball bat sized with a vampire like connection. Cat-5: Transceiver Category 5: Unshielded Twisted Pair (UTP) Most Popular Higher the Category, the more twists, the more twists, the better the signal strength. Connection: RJ-45 Max Distance: 100 meters ..
The Evolution of Ethernet 1973: Xerox invents Ethernet (3 Mbps) 1982: Ethernet Standardized Between Vendors (10 Mbps) – Prior to this everything was proprietory, so would have to purchase everything from the same vendor. 1995: Fast Ethernet Emerges (100 Mbps) 2000: Gigabit Ethernet (1000 Mbps) 2002: 10 Gigabit Ethernet (10,000 Mbps) 2007: 100 Gigabit Ethernet ..
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