Exam (elaborations)
NEW EXTRON EXAM QUESTIONS AND ANSWERS
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NEW EXTRON EXAM QUESTIONS AND ANSWERS....
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User Datagram Protocol (UDP) - ANSWER User Datagram Protocol providesa connectionless, no error detection and correction data transport.
Transmission Control Protocol (TCP) - ANSWER provides reliable, sequential
and error-checked delivery of an ordered stream of packets over the Internet.
TCP cannot be separated from IP and hence is usually seen as TCP/ IP in print.
IPv4 - ANSWER Uses 32-bit decimal-based values, from 0-255, expressed as
dot addresses and provides 4.3 billion combinations.
IPv6 - ANSWER Uses 128-bit Hexadecimal values from 0-FFFF, providing
about 340 undecillion addresses.
Subnets - ANSWER Use user routers to determine who comes and goes and
controls across an entire network. Partitioning of a network is useful for security
and performance by improving bandwidth and lightening network
administration.
Subnet Mask - ANSWER Hides or "masks" the network part of a device's IP
address, leaving only the host part as the identifier of the device.
Default Gateway- ANSWER Used to interconnect two autonomous networks.
The gateway would permit devices from one network having specified IP
settings to communicate with devices of another network having different IP
settings.
,MAC Address - Media Access Control. Unique 48-bit identifiers expressed as a
12-digit hexadecimal numbers, separated by dashes or colons. Burned In
Address - BIA. First six digits are registered as the manufacturer's ID number
and remaining represents the device's unique number.
Physical Layer 1 - Hardware specifications, encoding and signalling,
transmission and reception, topology and physincal network design.
Data Link Layer 2- ANSWER Logical link control, Media access control,
framing of data, error detection, cyclic redundancy check, VLAN tagging, CRC.
Network Layer 3- ANSWER Logical addressing of IP, DNS, FQDN, WINS,
routing, encapsulation of datagram, error handling and diagnostic.
ARP ANSWER Lies between layers 2 and 3 as protocol for translation of
network layer addresses into link layer addresses. Resolves IP addresses to
MAC addresses.
Transport Layer 4 ANSWER RTP, RTSP, RTMP.
Layer 5 Session ANSWER The persistent logical linking of two software
application processes, to enable them to exchange data over an extended period
of time.
Presentation Layer 6 - ANSWER Handles the presentation of data as it is sent
from one system, but needs to viewed differently by other systems. Translations
for connecting different types of computers together, compression and
decompression to improve throughput of data, encryption ensures data security
as it travels down the protocol stack.
, Application Layer 7 - ANSWER FTP, HTTP, DNS
Switch - ANSWER Acts as a controller. Using its Layer 2 function of
information sharing and resource allocation, multiple users can transmit
information all at the same time with only minimal delay.
Router - This is the bridge between the remote networks or across different
subnets. As such, routers are capable of identifying by means of the
connectivity of subnet communication internally and across several networks as
a layer-3 function, the next hop a packet may be forwarded to its destination.
Wiring Pinouts - ANSWER T568B to T568B cables send signals "straight
through" for connecting devices of different types such as a computer to a
network switch. When one end of the cable is T568A, and another is T568B,
this is called a crossover cable and used most often to connect two devices of
the same type, for example, two computers. Most computer network ports today
support Auto MDI-X to auto-detect the proper wiring.
MDX-I - ANSWER Network interface that automatically detects the type of
Ethernet cable being used - straight through, or crossover. It will switch over to
accommodate the connection, based on interface detection.
Cable Shielding - ANSWER · Unshielded Twisted Pair - UTP (no overall
shield, no wire pair shield)
· Foil/Unshielded Twisted Pair - F/UTP (overall foil, unshielded wire pairs)
· Unshielded/Foil Twisted Pair - U/FTP: no overall shield, foil wire pairs
· Foil/Foil Twisted Pair - F/FTP: overall foil, foil wire pairs
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