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21. Thicknet:
The maximum segment length of a 10Base5 Thicknet is 500 meters.
Maximum number of segments:5
Maximum segments with nodes:
3
Maximum number of repeaters: 4
Maximum overall length with
repeaters: 2.5 kilometers
Maximum AUI drop cable length: 50 meters
Thicknet uses 15 pin AUI connector.
22. 10BaseT Ethernet specifies UTP cabling. UTP cabling uses RJ-45 connectors to connect the cable to the NIC (Network Interface Card).
23.
10BaseT is an example of STAR topology
10Base2 is an example of BUS topology
FDDI is an example of fiber optic network based on ring topology.
10Base2 cable uses 50 Ohm, RG-58 cable also called Thinnet.
10Base5 cable uses 50 Ohm, RG-8, or RG-11 cable also called Thicknet.
24. One of the disadvantages of 10Base2 Ethernet is that, any cable break at any point on the network may cause breakdown of the entire network.
25. Some of the important TCP/IP related diagnostic commands that need to be practiced for Network+ exam are:
| Command | Description |
|---|---|
| PING | Used to ping the remote system (or the local host) to see that the TCP/IP connection is through. |
| NBTSTAT | This utility displays current NetBIOS over TCP/IP connections, and display NetBIOS name cache. |
| NETSTAT | Displays protocol statistics and current TCP/IP connections since the server was last booted. |
| TRACERT | Used to determine which route a packet takes to reach its destination from source. |
| IPCONFIG | Used to display Windows IP configuration information. |
| NSLOOKUP | This utility enables users to interact with a DNS server and display resource records. |
| ROUTE | Used to display and edit static routing tables. |
26. WAN (Wide Area Network) devices extend the reach of LAN (Local
Area Network) devices. WANT typically span over a wide area, such
over multiple cities / countries. WANS are connected over serial
lines that operate at lower speeds than LANs. Some of the WAN devices
are:
1. Routers: Routers are responsible for routing the packets
in an internetwork.
2. Modems: Modems connect to public telephone
circuits through dial-up.
3. CSU/DSU: Stands for Channel Service
Unit / Data Service Unit. CSU/DSUs are used for connecting to Central
Office of a Telephone switching company and provides serial WAN
connections.
4.Communication Servers: These are used for dial
in/out to remote users. Provides RAS Remote Access Server) functionality.
5. Multiplexers (mux): Multiplexers combine two or more signals
before transmitting on a single channel. Multiplexing can be done
by sharing "time" or "frequency".
27. Routing protocols job is to maintain routing tables
and route packets appropriately. Examples of routing protocols are
RIP, IGRP,EIGRP,OSPF. Routers can support multiple independent routing
protocols and can update and maintain routing tables for each protocol
independently.
Routed protocols are used to transport user traffic
from source node to destination node. Examples of routed protocols
are IP, IPX, AppleTalk.
28. Both PPP and SLIP can be used for dial up connections. However,
SLIP can't be used where the IP address need to be assigned dynamically.
The advantage of PPP is multi protocol support, that it can support
TCP/IP, IPX, AppleTalk etc. SLIP can support only TCP/IP and IP
addresses need to be assigned manually.
29. Default subnet mask for Class A network: 255.0.0.0
Default
subnet mask for Class B network: 255.255.0.0
Default subnet mask
for Class C network: 255.255.255.0
30. The transmission speed of a T1 circuit (Used mainly in North
America) is 1.544Mbps
The transmission speed of an E1 circuit
(Used mainly in Europe) is 2.048Mbps.
The transmission speed
of a T3 circuit (Used mainly in North America) is 44.736 mbps
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