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26 Cards in this Set
- Front
- Back
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What does a hub do?
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• A hub provides a central connection for multiple media segments on the same subnet. The hub repeats a signal received on one port out all other ports. Hubs operate in half-duplex mode because the path between devices is shared, meaning that devices can only send when no other devices are sending data.
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What does a switch do?
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• A switch provides a central connection for multiple media segments on the same subnet. The switch receives a signal on one port, and forwards that signal only to the port where the destination device is connected.
o Switches use the MAC address to send frames to the destination device. o Switches can operate in full duplex mode where a device uses a different channel for sending and receiving, and where the transmission paths are dedicated to only the communicating devices. o When possible, use switches instead of hubs |
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What does a router do?
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• A router connects two network segments that have a different subnet address.
○ A router has multiple network connections, with each connection being on a different subnet. ○ Routers use the IP address within a packet to move packets between networks. |
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What does a bridge do?
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• A bridge connects two segments within the same subnet that use different media types. For example, use a bridge to connect wireless clients to wired clients on the same network.
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What are the Ethernet standards that identify the transmission speed and the cable type?
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• Data transfer rates are between10 Mbps (older Ethernet networks) to up to 10 Gbps. 100 and 1000 Mbps are the most common for desktop computers.
• The letter T identifies twisted pair cables; the letters F, S, L, and E are used for fiber optic. |
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What are the minimum categories of twisted pair of cables?
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• 10BaseT requires Cat3 or higher.
• 100BaseTX and 1000BaseT require Cat5 or higher. • 10GBaseT requires Cat5e or higher. |
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What does ipconfig do?
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Ipconfig displays IP configuration information for network adapters. Use the ipconfig command as follows:
• Use ipconfig to view IP address, subnet mask, and default gateway configuration. • Use ipconfig /all to view detailed configuration information including the MAC address and the DHCP server used for configuration. • Use ipconfig /release to release the IP configuration information obtained from the DHCP server. • Use ipconfig /renew to request new IP configuration information from the DHCP server. |
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What does ping do?
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Ping sends an ICMP echo request/reply packet to a remote host. A response from the remote host indicates that both hosts are correctly configured and a connection exists between them.
You can ping a host by IP address or use the DNS name. When the DNS name is used, the computer must look up the corresponding IP address before performing the ping test. • Use the -a switch to look up the hostname from a given IP address. • Use the -t switch to do a continuous ping test. Use Ctrl + C to stop sending ping tests. • Use the -l switch to configure the packet payload size to use in the test. With this test, you can identify when packets above a certain size are being lost. |
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What does tracert do?
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Like ping, tracert tests connectivity between devices, but as it does so it shows the path between the two devices. Responses from each hop on the route are measured three times to provide an accurate representation of how long the packet takes to reach, and be returned by that host.
• On a Windows system, use the tracert command. • On most other systems, use the traceroute command. |
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What does nslookup do?
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slookup resolves (looks up) the IP address of a host name. It also displays other name resolution-related information such as the DNS server used for the lookup request.
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What does netstat do?
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Netstat shows IP-related statistics including:
• Current connections • Incoming and outgoing connections • Active sessions, ports, and sockets • The local routing table |
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What does Telnet or SSH
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Both Telnet and SSH are tools for remote management of servers.
• Use Telnet or SSH to remotely log on to a server and complete configuration tasks. • If you can successfully connect to the server, it means that the server is configured, the network connection to the server works, and the service is configured to respond. • SSH provides a secure connection; Telnet does not. |
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What is the class A range?
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• 1-126
• Subnet Mask: 255.0.0.0. • Private 10.x.x.x |
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What is the class B range?
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• 128-191
• Subnet Mask:255.255.0.0 • Private: 172.16.0.0-172.31.255.255 |
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What is the class C range?
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192-223
Subnet Maks: 255.255.255.0 Private:192.168.x.x |
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FTP
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port 20 and 21
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SSH(Secure Shell)
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port 22
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SMTP(Simple Mail Transfer Protocol)
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port 25
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HTTP(Hypertext Transfer Protocol)
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port 80
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POP3 (Post Office Protocol)
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port 110
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Telnet
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port 23
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HTTPS
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port 443
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What is the speed of 802.11a ?
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54Mbps, 5 GHZ, OFDM
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What is the speed of 802.11b ?
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11Mbps, 2.4 GHz, DSSS
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What is the speed of 802.11g ?
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54Mbps, 2.4 GHz, OFDM
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What is the speed of 802.11n ?
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600Mbps (300 typically), 5 and 2,4GHz, OFDM
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