upc rychlost internetu CompTIA Network+ All-in-One Exam Guide in Software

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CompTIA Network+ All-in-One Exam Guide
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Layer 2 Switch Any device that filters and forwards data packets based on the MAC addresses of the sending and receiving machines What we normally call a switch is actually a Layer 2 switch Layer 2 Tunneling Protocol (L2TP) A VPN protocol developed by Cisco that can be run on almost any connection imaginable LT2P has no authentication or encryption, but uses IPSec for all its security needs Layer 3 Switch Also known as a router, filters and forwards data packets based on the IP addresses of the sending and receiving machines LC A duplex type of Small Form Factor (SFF) fiber connector, designed to accept two fiber cables LED (Light Emitting Diodes) quencies when current is applied Solid-state devices that vibrate at luminous fre-
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Light Leakage The type of interference caused by bending a piece of fiber-optic cable past its maximum bend radius Light bleeds through the cladding, causing signal distortion and loss Lightweight Extensible Authentication Protocol (LEAP) A proprietary EAP authentication used almost exclusively by Cisco wireless products LEAP is an interesting combination of MS-CHAP authentication between a wireless client and a RADIUS server Link Light An LED on NICs, hubs, and switches that lights up to show good connection between the devices Link-Local Address The address that a computer running IPv6 gives itself after first booting The first 64 bits of a link-local address is always FE80::/64 Link Segments Segments that link other segments together but are unpopulated or have no computers directly attached to them Link State Type of dynamic routing protocol that announces only changes to routing tables, as opposed to entire routing tables Compare to distance vector routing protocols Linux The popular open source UNIX-clone operating system
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Listening Port A socket that is prepared to respond to any IP packets destined for that socket s port number LMHOSTS File A static text file that resides on a computer and is used to resolve NetBIOS names to IP addresses The LMHOSTS file is checked before the machine sends a name resolution request to a WINS name server The LMHOSTS file has no extension Load Balancing The process of taking several servers and making them look like a single server
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Local Refers to the computer(s), server(s), and/or LAN that a user is physically using or that is in the same room or building Local Connector One popular type of Small Form Factor (SFF) connector, considered by many to be the predominant fiber connector Local User Accounts The accounts unique to a single Windows system Stored in the local system s registry Localhost The HOSTS file alias for the loopback address of 127001, referring to the current machine Logical Address A programmable network address, unlike a physical address that is burned into ROM Logical Network Diagram A document that shows the broadcast domains and individual IP addresses for all devices on the network Only critical switches and routers are shown Logical Topology A network topology defined by signal paths as opposed to the physical layout of the cables See also Physical Topology Loopback Address Sometimes called the localhost, a reserved IP address used for internal testing: 127001 Loopback Plug Network connector that connects back into itself, used to connect loopback tests Loopback Test A special test often included in diagnostic software that sends data out of the NIC and checks to see if it comes back MAC (Media Access Control) Address Unique 48-bit address assigned to each network card IEEE assigns blocks of possible addresses to various NIC manufacturers to help ensure that each address is unique The Data Link layer of the OSI sevenlayer model uses MAC addresses for locating machines MAC Address Filtering A method of limiting access to a wireless network based on the physical addresses of wireless NICs MAC Filtering See MAC Address Filtering
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Macro A specially written application macro (collection of commands) that performs the same functions as a virus These macros normally autostart when the application is run and then make copies of themselves, often propagating across networks Mailbox user Special holding area on an e-mail server that separates out e-mail for each
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Malware Any program or code (macro, script, and so on) that s designed to do something on a system or network that you don t want to have happen
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