Basic Enterprise Network
Architectures
1. (Multiple Choice) Which of the following network
topologies are the widely used backbone network topologies? (Select 2 Answers)
A.Full Mesh
B.Plane Hierarchical
structure
C.Plane and Space
Hierarchical structure
D.Multi-homing structure
2. (Multiple Choice) The metropolitan area network which is
located between backbone network and access network consists of ( ). (Select 3 Answers)
A.Carrier layer
B.Core layer
C.Convergence layer
D.Access layer
3. (Single Choice) In a complete IP network, which of the
following networks does a Layer 2 network under the service access control
point belong to?
A.Backbone network
B.Metropolitan area
network (MAN)
C.Access network
D.Core network
4. (Multiple Choice) When a backbone network uses dual
planes, which of the following statements are true? (Select 2 Answers)
A.When a fault occurs on
one plane, the other plane cannot function as the backup of the faulty plane.
B.The two planes generally
carry different services.
C.In normal situations,
the services on the two planes do not affect each other.
D.Compared with a
dual-plane structure, a hierarchical plane is more reliable.
Enterprise Network
Constructs
1. (Single Choice) Keyboard is used to input
data only. Which of the following is the transmission mode of the
keyboard?
A.Simplex mode
B.Half-duplex mode
C.Full-duplex mode
D.Auto negotiation
2. (Multiple Choice) Which of the following
communication types are defined based on information interaction between the
transmitter and the receiver? (Select 3
Answers)
A.Simplex
B.Half-duplex
C.Duplex
D.Auto-negotiation
3. (Single Choice) Coaxial cables can be classified into different types by
diameter. One of these types of the coaxial cables is suitable for relatively
large LAN because it supports long distance and provides high reliability.
Which of the following coaxial cables belongs to this type?
A.Coaxial cable with a
large diameter
B.Coaxial cable with a
small diameter
C.10-core coaxial cable
D.16-core coaxial cable
4. (Single Choice) A transmission medium consists of glass
fibers and a shield layer. It is free from interference of magnetic signals and
provides high-speed and long-distance transmission. But such a matter is very
expensive. What is this matter?
A.Coaxial cable
B.Twisted pair cable
C.Optical fiber
D.Waveguide fiber
5. (Multiple Choice) Which device operates at physical layer?
A.Switch
B.Hub
C.Router
D.Firewall
6. (Multiple Choice) What are transmission media of physical
layer? (Select 3 Answers)
A.Fiber
B.Twisted pair cable
C.Radio wave
D.Ethernet
7. (Multiple Choice) What are wiring standards for physical
layer related to LAN? (Select 3 Answers)
A.100Base-T
B. HDLC
C.100Base-FX
D.1000Base-SX/LX
8. (Multiple Choice) Which of the following are physical
interfaces? (Select 4 Answers)
A.Dialer interface
B.Voice interface
C.Serial interface
D.Sub interface
E.CE1/PRI interface
F. Virtual interface template
G.. ISDN BRI interface
9. (Single Choice) Which of the following fibers allows for
multiangular incidence of “multiple” beams of light for transmission?
A.4-core fiber
B.“Single”-mode fiber
C.Multimode fiber
D.Active fiber
10. (Single Choice) To improve a twisted pair cable's
capability to withstand magnetic interference, which of the following layers
can be added as a shield layer of the twisted pair cable?
A.STP
B.UTP
C.BTP
D.RPR
11. (Single Choice) Both analog transmission and digital
transmission can use twisted pair cables. Which of the following statement is
true?
A.The communication
distance increases with the diameter of the conductor.
B.The communication
distance decreases with the diameter of the conductor.
C.The communication
distance is independent of the diameter of the conductor.
D.The communication
distance increases with the diameter of the conductor when the communication
distance exceeds 50 km.
12. (Single Choice) In Ethernet standard, which of the
following mechanisms is used to avoid collision when different nodes transmit
packets simultaneously?
A.CSMA/CA
B.CSMA/DA
C.CSMA/CD
D.CSMA/AC
13. (Single Choice) The distance limit of category 5 UTP
wiring is ( ).
A.100 meters
B.200 meters
C.50 meters
D.185 meters
14. (Single Choice) Two computers are connected to each other
by using twisted pair cable. The correct wiring sequence is ( ).
A.Computers can not be
directly connected with twisted pair cable
B.1--1, 2--2, 3--3, 4--4,
5--5, 6--6, 7--7, 8--8
C.1--3, 2--6, 3--1, 4--4,
5--5, 6--2, 7--7, 8--8
D.1--2, 2--1, 3--6, 4--4,
5--5, 6--3, 7--7, 8-8
15. (Single Choice) A PC is connected to router's Ethernet
port through its network interface card. What type of cable should be used to
connect these two interfaces?
A.Cross cable
B.Straight cable
C.Console cable
D.Backup cable
16. (Single Choice) How long can a fast Ethernet cable
100BaseTX or 100BaseT4 transmit a signal?
A.100m
B.550m
C.1000m
D.2000m
17. (Single Choice) How long can a
Gigabit Ethernet cable 1000BaseT transmit a signal?
A.100m
B.550m
C.1000m
D.2000m
18. (Multiple Choice) Which transmission rates does an
Ethernet allow for? (Select 3 Answers)
A.10M
B.100M
C.1000M
D.155M
19. (Single Choice) After receiving a data frame from any port,
a hub forwards it to any other port.
T.True
F.False
20. (Single Choice) Which communication mode does a hub work
in?
A.Simplex
B.Half-duplex
C.Full-duplex mode
D.Auto-negotiation
21. (Single Choice) Which type of Ethernet uses hubs?
A.Star Ethernet
B.Shared Ethernet
C.Switched Ethernet
D.Token ring Ethernet
22. (Multiple Choice) The physical medium used by Ethernet
include ( ). (Select 3 Answers)
A.Coaxial cable
B.Twisted pair cable
C.Optical fiber
D.V.35 cable
23. (Single Choice) multiple PCs are connected to the same
hub through twisted pair cables. What's its logical topology structure?
A.Star
B.Tree
C.Mesh
D.Ring
E.Bus
24. (Single Choice) Under Which of the following
circumstances, “multiple” work stations belong to the same collision domain?
A.“multiple” workstations
are connected to a hub through twisted pair cables
B.“multiple” workstations
are connected to a LAN switch through twisted pair cables
C.“multiple” workstations
are connected to a router through twisted pair cables
D.“multiple” workstations
are connected to a bridge through twisted pair cables
25. (Multiple Choice) In late 1980s, UTP appeared and was
widely used. Which of the following are advantages of UTP? (Select 3 Answers)
A.Low price
B.Easy to manufacture
C.Receive and transmit
using different wires
D.Both of the physical and
logical topology is bus type
26. (Single Choice) How to eliminate the collision in
Ethernet?
A.Increase the length of
cable
B.Decrease the number of
transmitted packets
C.Decrease the number of
users on each network segment
D.Replace the hub and
repeater with switch or bridge
27. (Single Choice) Which of the following statements
regarding collision is incorrect?
A.Each ports of switch is
an independent collision domain.
B.The collision that
happens in the network connected with one port of a switch will affect another
network connected with another port of the switch.
C.The number of the
collision domains will be increased if the hub in the network is replaced with
the bridge.
D.Reduce the number of
hosts in a network can decrease probability of collision.
28. (Multiple Choice) What kind of wirings does 100BaseT4
Fast Ethernet specification use? (Select
3 Answers)
A.Category 3 UTP
B.Category 4 UTP
C.Category 5 UTP
D.Category 6 UTP
29. (Single Choice) An Ethernet electrical port can work in
three types of duplex modes, whereas an Ethernet optical port can work in only
one mode. Which of the following represents this mode?
A.Full-duplex
B.Half-duplex
C.Auto-negotiation
D.Simplex
30. (Single Choice) Which layer implements auto-negotiation
in an Ethernet without using private datagrams?
A.Application Layer
B.Network Layer
C.Data Link Layer
D.Chips at Physical Layer
Ethernet Framing
Multiple Choice) A complete data communication system
includes ( )
A.Sender
B.Receiver
C.Harddisk
D.Message
E.Protocol
2. (Single Choice) The (
) is the physical path along which a message passes.
A.Sender
B.Receiver
C.Harddisk
D.Message
E.Protocol
3. (Multiple Choice) Network topology type includes: (Select 4 Answers)
A.Bus
B.Star
C.Tree
D.Peer-to-peer
E.Mesh
4. (Single Choice) Which of the following network topologies
has the highest reliability?
A.Bus
B.Star
C.Ring
D.Mesh
5. (Multiple Choice) According to the scope of
the geographical area,network type includes?
(Select 2 Answers)
A.Campus network
B.LAN
C.WAN
D.Enterprise network
6. (Single Choice) Which organizations drafts RFC (Request
for Comments)?
A.IEEE
B.ITU-T
C.IETF
D.ISO
7. (Single Choice) Which of the following standard
organizations has defined the protocol for LAN such as 802 series protocols?
A.IEEE
B.ITU-T
C.IETF
D.ETSI
8. (Single Choice) Which network topology has risk of whole
network failure when a link is broken?
A.Mesh
B.Bus
C.Star
D.Tree
9. (Multiple Choice) Which of the following network
topologies consist of redundant links between any two nodes? (Select 2 Answers)
A.Mesh
B.Star
C.Tree
D.Bus
E.Ring
10. (Single Choice) In data communications, the data format
must be determined and agreed by the information creator and the information
receiver before the data is transmitted.
T. True
F. False
11. (Multiple Choice) The most significant feature of a local
area network (LAN) is that the LAN is intended for only one organization and is
geographically limited, allowing interconnections of a limited number of
stations. Which of the following transmission media are most common to a
LAN? (Select 3 Answers)
A.Fiber
B.Coaxial cable
C.Twisted pair cable
D.ADSL
12. (Multiple Choice) The OSI reference model defines a
simple hierarchical network model for a computer network. Which of the
following standardization organizations develops the OSI reference model?
A.ISO
B.IEEE
C.ITU
D.IETF
13. (Single Choice) A network provides data communication
services for a relatively large geographical area and is mainly used to
interconnect LANs. Which network type does this network belong to?
A.Large LAN
B.Wide area network (WAN)
C.Metropolitan area
network (MAN)
D.Backbone network
14. (Single Choice) The bus and star topologies, which are
frequently used in a LAN, refer to the physical connection types rather than
the logical structure of the network.
T.True
F.False
15. (Single Choice) When a node transmits data over a network
medium, the data is transmitted to all the nodes on the network. Which topology
does this network use?
A.Star
B.Bus
C.Tree
D.Ring
16. (Single Choice) A topological structure has a central
control point to enable easy network design and equipment installation. The
network media connect to the area where workstations reside through the hub or
switch at the central control point. The disadvantage of such a structure is
that a fault on the hub or switch results in a “single”-point fault. Which
topology does this type of LAN usually use?
A.Star
B.Bus
C.Tree
D.Ring
17. (Multiple Choice) As a device for converting signals
between an edge system and a communications system, a modem is essential in a
WAN. A modem is connected to a serial port on a router. Which two of the
following transmission modes does the serial port work in? (Select 2 Answers)
A.Synchronous
B.Asynchronous
C.Switching
D.Routing
18. (Single Choice) Which of the following statements is
incorrect regarding LAN features?
A.High transmission
efficiency and high reliability
B.The structure is simple
and easy to be constructed.
C.Extensive coverage
D.Large coverage scale
19. (Single Choice) In OSI reference model, OSI stands for
( ).
A.Organization Standard
Institute
B.Organization Standard
Interconnection
C.Open System Internet
D.Open System
Interconnection
20. (Single Choice) How many layers are included
in OSI reference model?
A.3
B.5
C.6
D.7
21. (Single Choice) According to OSI reference model, when a
packet is transmitted from upper layer to lower layer, the header will be
( )
A.Added
B.Removed
C.Rearranged
D.Modified
22. (Single Choice) In OSI reference model, Transport Layer
is located at layer ( ).
A.3
B.4
C.6
D.7
23. (Single Choice) In OSI reference model, which layer
resides at the bottom?
A.Data link layer
B.Application layer
C.Physical layer
D.Network layer
24. (Multiple Choice) According to OSI reference model, which
layer defines mechanical, electrical, functional and procedural functions to
realize data transmission?
A.Transport layer
B.Data link layer
C.Network layer
D.Physical layer
25. (Single Choice) The PDU (Protocol Data Unit) that resides
at physical layer is called ( )
A.Frame
B.Packet
C.Segment
D.Binary bit flow
26. (Single Choice) The PDU (Protocol Data Unit) that resides
at data link layer is called ( ).
A.Binary bit flow
B.Frame
C.Packet
D.Segment
27. (Multiple Choice) Which of the following protocols reside
at data link layer? (Select 3 Answers)
A.PPP
B.HDLC
C.IP
D.IEEE 802.3
28. (Multiple Choice) Data link layer has two sub-layers,
they are ( ) (Select 2 Answers)
A.PVC sub-layer
B.MAC sub-layer
C.LLC sub-layer
D.VC sub-layer
29. (Multiple Choice) Which of the following devices operate
at data link layer? (Select 2 Answers)
A.Hub
B.Bridge
C.Switch
D.Router
E.Firewall
30. (Single Choice) Which of the following is the broadcast
MAC address?
A.FF-FF-FF-FF
B.FF-FF-FF-FF-FF-FF
C.00-00-00-00-00-00
D.00-00-00-FF-FF-FF
31. (Multiple Choice) Which of the following protocols are
related to WAN? (Select 2 Answers)
A.Ethernet
B.PPP
C.HDLC
D.UDP
32. (Single Choice) According to OSI reference model, router
operates at ( )
A.Physical layer
B.Data link layer
C.Network layer
D.Application layer
33. (Single Choice) The protocol data unit that resides at
network layer is called ( ).
A.Segment
B.Packet
C.Bit
D.Frame
34. (Single Choice) According to OSI reference model, which
of the following statements about the function of network layer is correct?
A.Ensure the correctness
of data transmission
B.Control the forwarding
and routing of data packet
C.Control transmission of
bit flow
D.Error correction and flow
control
35. (Single Choice) The OSI reference model contains seven
layers in two groups, namely, upper layer and lower layer. The upper layer
starts from ( ) to Layer 7 and is also
called host layer.
A.Layer 2
B.Layer 3
C.Layer 4
D.Layer 5
36. (Single Choice) The upper layer of the OSI reference
model ensures that data is transmitted properly. Which of the following at the
upper layer is used to ensure this?
A.Hardware
B.Software
C.Both hardware and
software
D.Either software or
hardware
37. (Single Choice) In the OSI reference model, one layer is
used to establish end-to-end connections between hosts and checks for bit
errors before data is transmitted or retransmitted. Which of the following
layers stands for this layer?
A.Data Link Layer
B.Physical Layer
C.Network Layer
D.Transport Layer
38. (Single Choice) In the OSI reference model, one layer
defines the format of data to be sent to the Application Layer in addition to
providing data encryption, data encoding, and data conversion. Which of the
following layers stands for this layer?
A.Presentation Layer
B.Session Layer
C.Network Layer
D.Application Layer
39. (Single Choice) In the OSI reference model, one layer
converts bits into bytes and then into frames in addition to providing medium
access. Which of the following layers stands for this layer?
A.Data Link Layer
B.Session Layer
C.Network Layer
D.Application Layer
40. (Single Choice) In the OSI reference model, one layer
transmits bit streams between devices. Which of the following layers stands for
this layer?
A.Data Link Layer
B.Physical Layer
C.Network Layer
D.Application Layer
41. (Multiple Choice) Which of the protocols are commonly
used at the Data Link Layer of a WAN?
(Select 2 Answers)
A.802.2
B.802.4
C.HDLC
D.PPP
42. (Multiple Choice) Which layers in OSI reference model
belong to upper layer, also called as host layer and are responsible for data
transmission and providing interface for user?
(Select 3 Answers)
A.Data link layer
B.Network layer
C.Transport layer
D.Session layer
E.Presentation layer
F. Application layer
43. (Multiple Choice) According to OSI reference model, which
of the following presents the correct layer sequence if packet goes from the
bottom of the protocol stack to the top?
A.Physical, Data link,
Network, Transport, Session, Presentation, Application
B.Physical, Data link,
Network, Transport, Presentation, Session, Application
C.Physical, Transport,
Data link, Network, Presentation, Session, Application
D.Physical, Data link,
Transport, Presentation, Network, Session, Application
44. (Multiple Choice) Which of the following are functions of
data link layer? (Select 4 Answers)
A.Physical address
definition
B.Network topology
discovery
C.Routing
D.Physical medium access
E.Error checking
45. (Multiple Choice) Which of the following are the
advantages of OSI reference model?
(Select 3 Answers)
A.Divide the complex
network into simple components
B.Make it impossible for
network engineers to concentrate on design and development of module functions
C.Define standard
interface to realize compatibility for different manufacturers
D.Divide complicated
network problem into simple problems to make it easier for learning and
operation
46. (Multiple Choice) Which of the following devices have
functions of all seven layers of OSI reference model? (Select
2 Answers)
A.Router
B.Email Server
C.Layer three switch
D.Network management
server
47. (Multiple Choice) According to TCP/IP reference model,
which of the following application layer protocols are based on TCP? (Select 3 Answers)
A.HTTP
B.TFTP
C.FTP
D.SMTP
E.SNMP
48. (Single Choice) A MAC address has ( ) bits.
A.6
B.12
C.24
D.48
49. (Single Choice) MAC address consists of two parts:
provider number and serial number. The first 24 bits of MAC address represents
provider number, which of the following is the provider number of Huawei?
A.00e0fc
B.0010fe
C.000001
D.0003cf
50. (Single Choice) Hub work at ( ) layer.
A.Physical
B.Data link
C.Network
D.Application
51. (Single Choice) According to OSI reference model, switch
operates at ( ) layer.
A.Physical
B.Data link
C.Transport
D.Application
52. (Single Choice) A switch receives entire data frame and
then perform CRC checking,the frame is forwarded unless CRC checking fails. The
switch mode for this switch is ?
A.Cut-Through
B.Store-and-Forward
C.Fragment-free
D.Store-free
53. (Multiple Choice) Which of the following are advantages
of layer 2 switch compared with hub?
(Select 3 Answers)
A.Increase the collision
B.Higher throughput
C.Higher port density
D.Isolate collision
domains
54. (Single Choice) (
) combines “multiple” ports to form an aggregation group. It can be used
to balance the traffic among member ports and improve the connection
reliability.
A.Port Aggregation
B.Port binding
C.Port load balance
D.Port group
55. (Multiple Choice) The data forwarding of the switch is
based on ( ).
A.Source MAC address
B.Destination MAC address
C.Source IP address
D.Destination IP address
56. (Multiple Choice) What describe the working principles of
Ethernet Switches? (Select 3 Answers)
A.Receive all the data
frames in the network segment
B.Generate MAC address
table according to the source MAC address of the received frame
C.Layer 3 packet
forwarding
D.Maintain MAC address
table with aging mechanism
57. (Single Choice) IEEE 802.3 frame contains ( ) bits of DSAP field. It is used to indicate
the upper layer protocols that are used.
A.8
B.4
C.16
D.24
58. (Single Choice) The last field of Ethernet frame is FCS
(Frame Check Sequence). Its length is (
) bytes.
A.2
B.4
C.8
D.32
59. (Multiple Choice) Which of the following statements about
switching modes of LAN switch are true?
(Select 2 Answers)
A.Store-and-forward
switching mode does not check for error frames.
B.Cut-through switching
mode forwards a frame after it received the first 64 octets of the frame.
C.Fragment-free switching
mode can check for error frames in the first 64 octets of the frame.
D.Store-and-forward
switching mode discards the frame with length less than 64 octets.
60. (Multiple Choice) Port mirroring means to get a copy of
the data and then send it to the monitoring device for data analysis and
diagnosis. Port mirroring can be divided into ( ).
(Select 2 Answers)
A.Port based mirroring
B.Application based
mirroring
C.Flow based mirroring
D.Upper layer protocol
based mirroring
61. (Single Choice) A MAC address consists of 48 bits and is
generally expressed in 12-bit dotted decimal notation. What kind of address
does a MAC address consisting of all 1s stand for?
A.Multicast address
B.Broadcast address
C.Unicast address
D.Virtual address
62. (Single Choice) Which of the following together with the
MAC address of a general L2 switch determines the MAC address table of the L2
switch?
A.RARP table
B.Transmission medium
C.Port
D.ARP table
63. (Single Choice) An L2 switch checks the MAC address
forwarding table before it forwards a packet. How does the L2 switch forward a
packet that contains an address not listed in the MAC address forwarding table?
A.Multicast
B.Broadcast
C.Unicast
D.Searching for routes
64. (Single Choice) The data field of standard Ethernet frame
is ( ) bytes.
A.40-1500
B.46-1500
C.64-1500
D.64-1518
65. (Single Choice) Which of the following commands can be
used to set Ethernet port so that buffer will not overflow when congestion
occurs?
A.Flow on
B.Flow-control
C.Flow control
D.Enable flow-control
66. (Multiple Choice) When congestion occurs on port working
in full duplex mode, switch will send "PAUSE" frame to the source to
notify the source temporarily stop sending message for a short while. Which of
the following circumstances can use the "PAUSE" method for flow
control? (Select 3 Answers)
A.A pair of terminals
B.A switch and a terminal
C.Congestion that occurs
on a stable network
D.The link between two
switches
E.End to end flow control
67. (Single Choice) In a destination MAC address, which bit
of the address determines whether a frame is sent to a “single” station or a
group of stations?
A.7
B.8
C.9
D.10
68. (Single Choice) Regardless of multicast or unicast, an L2
switch establishes its MAC address table entries by means of MAC address
learning.
T.True
F.False
Basic Enterprise Network Architectures
1.BC
2.BCD
3.C
4.BC
Enterprise Network Constructs
1.A
2.ABC
3.A
4.C
5.B
6.ABC
7.ACD
8.BCEG
9.C
10.A
11.A
12.C
13.A
14.C
15.A
16.A
17.A
18.ABC
19.T
20.B
21.B
22.ABC
23.E
24.A
25.ABC
26.D
27.B
28.ABC
29.A
30.D
Answers
Ethernet Framing
1.ABDE
2.C
3.ABCE
4.D
5.BC
6.C
7.A
8.B
9.AE
10.T
11.ABC
12.A
13.B
14.F
15.B
16.A
17.AB
18.D
19.D
20.D
21.A
22.B
23.C
24.D
25.D
26.B
27.ABD
28.BC
29.BC
30.B
31.BC
32.C
33.B
34.B
35.D
36.B
37.D
38.A
39.A
40.B
41.CD
42DEF
43.A
44.ABDE
45.ACD
46.BD
47.ACD
48.D
49.A
50.A
51.B
52.B
53.BCD
54.A
55.B
56.ABD
57.A
58.B
59.CD
60.AC
61.B
62.C
63.B
64.B
65.B
66.ABD
67.B
68.F
No comments:
Post a Comment