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Operating System
Module 8
| Question | Answer |
|---|---|
| Networking Technologies Common types | LAN, WLAN, AND WAN |
| LAN | term often used to describe wired local area networks (Ethernet Network) |
| WLAN | describes a wireless LAN (WiFi 802.11) |
| WAN | describes a wide area network, technologies that connect separate LANs |
| What is a data segment? | Data transmitted on a network that has been broken up |
| Baseband Technologies | Ethernet |
| Broadband Technologies | Cable, DSL, Satellite, Fiber-based |
| Cable | uses cable TV infrastructure |
| DSL | uses Public Switch Telenetwork (PSTN) infrastructure |
| Satellite | uses GEO synchronous satellites, connecting devices may be stationary or mobile |
| Fiber-based | uses a fiber-optic network |
| This company runs fiber all the way to the house or business: | Verizon |
| 802.11 Wi-Fi | oVarious IEEE standards (802.11b/g/n) oLess secure than wired networks oPublic Wi-Fi access: Hot Spots |
| The name of the wireless access point is called: | Service Set Identifier (SSID) |
| 802.16 Wi-Max | oVarious IEEE standards (802.16d/e) oUses base stations (cell towers) |
| Cellular | oVarious Technologies (TDMA, GSM, CDMA, 3G, 4G) oUses base stations (cell towers) oPC accessible with an Internet Card (Air Card) |
| Bluetooth | oShort range technology often used for device to device connections |
| Dialup Technology | •Mature technology that uses PSTN infrastructure, often follows V.92 standard •Maximum theoretical throughput: 56K |
| Network Adapters (NIC) | oOn-board or discrete components (including USB) oIdentified by technology (Ethernet, 100BaseT, etc.) |
| The NIC number used to identify the adapter on the network is called | MAC address |
| Cables/Connectors (fiber and copper) | oVarious cable and connector types oMost common copper-based cabling in use today: UTP oFinished cables types: straight-through (patch cords) and crossover |
| Devices | oHubs – repeat all packets received to all connected nodes oSwitches – direct packets to addressed device oWAP – bridges WLAN to LAN, connects hotspots together |
| This device manages traffic between two (different) networks: | Routers |
| Windows on a Network | •Client/Server Applications •Network communications can be broken into layers •Service Identifications |
| Client/Server Applications | oWeb Browser/Web Server oEmail Client/Exchange Server oFTP Client/FTP Server |
| Service Identifications | oPort/Port Address/Port Number – identifying numbers oSocket Address – combination of IP Address and port number (192.168.0.10:23) |
| The port number used by SMTP is: | 25 |
| IP Addresses | Identify the PC (node) on the network |
| IP Addresses two current versions | IPv4 and IPv6 |
| IPv4 | 32-bits, dotted decimal notation, three classes (A, B & C), uses a subnet mask Example: Class C, ip address:192.168.0.1, subnet mask: 255.255.255.0 |
| IPv6 | 128-bits, written in hexadecimal, various types, no subnet mask Example: 12:34:56:AB:10::37:55:12:B5:DC:FF:18 |
| IP Address Assignments | oPublic and private addresses oDynamically and statically assigned oReserved addresses: broadcasts, loopback, and network identifiers |
| A computer set to obtain a DHCP address fails to lease an address, what address will it use? | Automatic Private IP Address (APIPA) |
| Hostname/computer name | identifies the PC on the network |
| Domain Name/Workgroup Name | identifies the network FQDN: consists of hostname and domain name |
| DNS | resolves the FQDN to an IP Address |
| TCP/IP | oIndividual Protocols working together to mange communication |
| Application Protocols | http, https, smtp, pop, imap, ftp, etc. |
| Communication Protocols | tcp, udp, ip, arp, icmp, igmp, etc |
| Network Protocols | Ethernet, ATM, token ring, etc |
| Virtual Private Networks (VPN) | oMethod of securing data traveling across a public telecommunications network oTechnique is called tunneling; uses encrypted data packets |
| Which VPN tunneling protocol is considered the weakest? | Point to Point Tunneling Protocol (PPTP) |
| TCP/IP Utilities | Command line troubleshooting tools |
| Tools and Utilities for Troubleshooting Networks | ping, ipconfig, telnet, nslookup, tracert, net, netstat |
| ping | connectivity test, uses echo requests, has various switches |
| ipconfig | configuration data, limited control over dynamic data (renew IP address) |
| telnet | remote node communication, unsecure |
| nslookup | provides access to namespace information |
| tracert | hop-by-hop connectivity test, uses echo requests |
| net | several commands in one, all focused on network connections |
| netstat | network activity statistics |
| Remote Desktop | oAccess to another PC across the network oAvailable on certain versions of Windows |
| Remote Assistance | oAccess to another PC across the network oAvailable on certain versions of Windows |
| What is a technician performing when he enters the command: nslookup 170.10.0.1? | Reverse Lookup |
| Identify the port number used by Remote Desktop. | 3389 |
| Hubs | repeat all packets received to all connected nodes |
| Switches | direct packets to addressed device |
| WAP | bridges WLAN to LAN, connects hotspots together |
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