1) IEEE stands for ___.
A) Instistute of Electrical and Electronics Engineering
B) Institute of Electrical and Electronics Engineers
C) Institute Ethernet and Electronics Engineering
Explanation:
Institute of Electrical and Electronics Engineers
2) Choose the correct IEEE standards used to manage various computer networks.
A) IEEE 802.1 = Network Management standards, IEEE 802.2 = General Data Link Layer standards
B) IEEE 802.3 = MAC layer protocols for a BUS network with CSMA/CD, IEEE 802.4 = MAC layer protocols for a BUS network with Token passing feature
C) IEEE 802.5 = MAC layer protocols for a Token RING network, IEEE 802.6 = Standars to operate a MAN (Metropolitan Area Network)
3) Choose the cables or media used to implement 802.3 ethernet network below.
A) 10Base5 = Thick Coaxial cable, 10Base2 = Thin Coaxial cable
B) 10BaseT = Twisted Pair cable, 10BaseF = Fiber Optic cable
C) 10Broad36 = Broadband signalling over 75 Ohm cable
4) Who designed or invented an Ethernet network for LANs in the year 1973?
A) Grahambell
5) What is the other name for an Ethernet network?
A) WAN
Explanation:
DIX is an acronym for DIGITAL, INTEL and XEROX who collaborated to develop a working ethernet standard for LAN networks.
6) An Ethernet Jack is ___.
A) RJ11
Explanation:
RJ in RJ-45 stands for Registered Jack.
7) What is the sped of a 100BaseT cable?
A) 10 mbps
Explanation:
The number before the word BASE indicates its speed. So a 10BaseT can carry up to 10 mbps while a 100BaseT can carry up to 100 mbps.
8) Choose the correct Base-T cables and their speeds.
A) 10Base-T = Ethernet with 10mbps, 100Base-T = Fast Ethernet with 100 mbps speed
B) 10GBase-T = Gigabit Ethernet with 1000 mbps or 1 gbps
C) 10GBase = 10 Gigabit Ethernet with 10 gbps speed
9) Choose the 10-GBase standard cables from the below options that can carry data of 10gbps without loss up to 10km distance.
A) 10GBase-LX4
Explanation:
These 10GBase optical fiber cables use SFP (Small Form Factor Pluggable) modules that take two fibers one for transmit and one for receive from. SFPs allow point to point connections over long distances.
10) Choose the correct Abbreviations used with 10GBase cables below.
A) SR (Short Range), LR (Low Reach)
B) LRM (Long Reach Multimode),
Explanation:
Also, there are other 10GBASE cables like LX4 (single mode and multimode), PR (for Passive networks), ZR (up to 80km distance), CX4 (copper cables supporting high data rate) etc.
11) Choose the correct abbreviations below.
A) CSMA - Carrier Sense Multiple Access
B) CD - Collision Detection
C) CA - Collision Avoidance
12) What is the meaning of Carrier Sense in CSMA (Carrier Sense Multiple Access)?
A) The abilitiy to check the shared transmission medium whether it is being used by any other node or not
B) The ability to restrict other nodes to access the shared medium
C) The ability to gain access to the shared medium
13) What are the advantages of Carrier Sensing?
A) Sensing a carrier can avoid simultaneous transmissions by other nodes
B) It will help in reducing retransmission of data frames due to collisions with other station data frames
C) It improves performance of the network as the individual nodes sense for a carrier present in the transmission medium before requesting access to it.
Explanation:
Carrier sensing is useful in a network shared by multiple nodes (Multiple Access).
14) What happens in an Ethernet network implementing CSMA-CD when a collision is detected?
A) The station retransmits the frame again immediately
B) The station retransmits the lost frames after a delay
C) The station retransmits the all frames after a delay
D) The station aborts the whole transmission of data
Explanation:
If the collision is detected for the second time also, the sending station waits two times usual wait time or delay time.
15) CSMA/CA method is best suited for a ___ network.
A) Wired
Explanation:
In wireless networks, Collision Detection is not easy as the stations can not communicate with peer stations. All stations can communicate only with an Access Point.
16) Choose the topologies used in a LAN network below.
A) BUS
17) In a ___ topology, all the nodes or stations are connected to a main central cable.
A) BUS
18) In ___ topology, all the nodes are connected like a ring when drawn pictorially on a paper.
A) BUS
19) In a ___ topology, the nodes or stations of a network are connected to a central hub or server.
A) BUS
20) A group of STAR topology networks connected to a BUS like a cable form or create the ___ topology as a whole.
A) BUS
Explanation:
TREE topology
21) Which is a network topology that is easy to build?
A) BUS, STAR
Explanation:
BUS and STAR topologies are easy to build, troubleshoot and maintain.
22) A RING network topology is costly to build and difficult to maintain. State TRUE/FALSE.
A) TRUE
23) Which is the network topology that is prone to bottlenecks though easy to install?
A) BUS
Explanation:
As the data should pass through a central hub always in a STAR network, the hub may limit transmission rate and cause bottle necks.
24) A STAR network topology offers high bandwidths over long distances. State TRUE/FALSE.
A) TRUE
25) Which is not an ethernet topology below?
A) STAR
26) Advantages of an Ethernet network are ___.
A) Easy to install and maintain even by persons with less technical knowledge
B) Cheaper to intall as the cables and RJ45 plugs are available in all varieties in open market
C) Easy to upgrade as the Ethernet is compatible with Gigabit-Ethernet, ATM (Asynchronous Transfer Mode) and Advanced Routing Switches.
27) What are the disadvantages of an Ethernet Network?
A) The length of Twisted pair copper cables can not be so long for good transmission quality.
B) Ethernet is fast only if the number of devices is less in the network due to CD (Collision Detection) technique. Only one device can transmit at a point of time.
C) Addition of new devices or stations slows down the network for all existing stations. Ethernet is suited only for low to medium traffic networks.
28) What are the other collision detection and recovery methods used along with Ethernet?
A) ALOHA
B) Slotted ALOHA, R-ALOHA
29) Which are the collision free methods/technologies used to access the Medium Access Control (MAC)?
A) Token Bus
C) Both Token Ring and Token Bus
30) What are the parts of An Ethernet Frame?
A) Header
C) FCS (Frame Check Sequence)
31) An Ethernet header contains ___ as the first two fields.
A) Destination MAC Address
C) Both Source MAC and Destination MAC addresses
32) The Frame Check Sequence (FCS) of an Ethernet Frame is a ___ code.
A) Cyclic Error Check
B) Cyclic Redundancy Check
Explanation:
32-bit Cyclic Redundancy check code of an FCS is used to check the integrity of data (payload) received. It can detect corrupted data or tampered data.
33) Each Frame in an Ethernet packet starts with a ___.
A) SFD (Start Frame Delimiter) with alternating 0 and 1 for 7 bytes
B) SFD (Start Frame Delimiter) with alternating 0 and 1 for 4 bytes
34) There is no separate Frame ending sequence in an Ethernet Packet after each frame. State TRUE/FALSE.
A) TRUE