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Worksheetsmạng máy tính hk1
Total questions: 56
Worksheet time: 28mins
Name
Class
Date
1.
Câu 1 How to handle peer churn in P2P?
a)
A. make shortcut to different nodes
b)
B. always store the whole network
c)
C. store multiple successor nodes
d)
D. make a circular network
2.
Câu 2 When using SMTP, users can
a)
A. access their mail box in the server
b)
B. wait for turn to receive emails
c)
C. request objects from server
d)
D. send files to clients
3.
Câu 3 Why is HTTP stateless?
a)
A. Because it does not use authorization
b)
B. Because it does not use session
c)
C. Because it closes the connection whenever it sends a response
d)
D. Because it does not remember the past information
4.
Câu 4 In non-persistent HTTP,
a)
A. multiple objects can be sent over single TCP connection between client, server
b)
B. at most one object sent over TCP connection
c)
C. clients download mutiple objects in servers using a connection
d)
D. Web server sends objects as request to clients
5.
Câu 5 How many types of records in DNS?
a)
A. 2
b)
B. 1
c)
C. 3
d)
D. 4
6.
Câu 6 a top-level domain is
a)
A. vnexpress.net
b)
B. .tk
c)
C. .com.vn
d)
D. org
7.
Câu 7 Choose the correct statement for TCP protocol
a)
A. Encrypt and compress data
b)
B. Ensure high reliability
c)
C. Unable to link
d)
D. Data exchange between network components
8.
Câu 9 Compare to POP3, IMAP can
a)
A. remember users
b)
B. authenticate users
c)
C. copy emails to many clients
d)
D. send and receive emails
9.
Câu 11 DNS has a similar feature to proxy, which is
a)
A. caching entries
b)
B. hierarchical architecture
c)
C. distributed systems
d)
D. forwarding messages to another server
10.
Câu 12 Suppose that a server has 10 mbps upload rate, what is the minimum time to deliver a file of 10MB to 5 clients?
a)
A. 9 seconds
b)
B. 7 seconds
c)
C. 5 seconds
d)
D. 8 seconds
11.
Câu 13 By default, TELNET service uses port number
a)
A. 21
b)
B. 25
c)
C. 69
d)
D. 23
12.
Câu 14 In computer network, P2P stands for
a)
A. Pay to Play
b)
B. Peer to Peer
c)
C. Point to Point
d)
D. Procure-To-Pay
13.
Câu 15 We use web caching to
a)
A. reduce response time for client request
b)
B. Reduce cost
c)
C. Hide the IP address
d)
D. provide more content to users
14.
Câu 16 A difference between HTTP and FTP is
a)
A. FTP does not use TCP
b)
B. packets in FTP are bigger so that it can transfer bigger files
c)
C. FTP is not stateless
d)
D. FTP can control the connection
15.
Câu 17 In HTTP, object cannot be
a)
A. Texts
b)
B. Images
c)
C. MP3 files
d)
D. URL
16.
Câu 19 UDP protocol is used for the application that
a)
A. Requires a link request
b)
B. Does not require high reliability
c)
C. Requires flow control and error control
d)
D. Requires high reliability
17.
Câu 20 Suppose that a client wants to request 11 objects from a server using persistent HTTP, how much time (in RTT) it needs to wait at least?
a)
A. 12
b)
B. 13
c)
C. 11
d)
D. 10
18.
Câu 21 What is the designated port number for TCP?
a)
A. 21
b)
B. 80
c)
C. 25
d)
D. 67
19.
Câu 22: Which port is commonly associated with HTTP?
a)
A. 53
b)
B. 80
c)
C. 110
d)
D. 21
20.
Câu 23: Which port is typically used for SMTP?
a)
A. 25
b)
B. 143
c)
C. 110
d)
D. None of the above
21.
Câu 1 : UDP protocol is often used for applications :
a)
A.Request connection-oriented
b)
B.Request high reliability
c)
C.Request low delay
d)
D.Do not request high realiability
22.
Câu 2: When using TCP protocol in the transport layer, the receiver will notify the sender max amount of data it can receive. The value is determined at the filed
a)
A.Sequences number
b)
B.ACK
c)
C.Rwnd
d)
D.Header line
23.
Câu 3: What are Internet standards?
a)
A. TCP and UDP
b)
B.ACK and NAK
c)
C.RFC and IETF
d)
D.FDM and TDM
24.
Câu 4 : What is RTT
a)
A.Time for inti TCP connection
b)
B.Time for sending small packet
c)
C.Time for sending small packet from a client to sever and come back
d)
D.Time for transferring file
25.
Câu 5 : Length of check sum segment
a)
A.4
b)
B.8
c)
C.16
d)
D.32
26.
Câu 6 : The application of TCP is
a)
A. Web, file trans, email
b)
B. Web, dns, voice over ip
c)
C. Video conference, voice over ip, streaming media
d)
D. Telnet, dns, email
27.
Câu 7 : UDP socket is determined by :
a)
A. Source IP address, destination IP address
b)
B. Source IP address, source port number
c)
C. Destination IP addressing, destination port
d)
D. All b, c, d
28.
Câu 8 : Why checksum cannot be certain that no bit errors have occurred?
a)
A. The sum operations
b)
B.The checksum can miscalculated
c)
C.The checksum can be correct but can not guarantee that individual package is correct x
d)
D.The delay of transferring data causes the check sum to be lost
29.
Câu 9 : 106, 129, 140, 90, 115, alpha = 125, estimated 100ms
a)
a. 100.75ms, 104.81, 109.21, 106.81, 107.83;
b)
b. 105.95ms, 105.64, 110.55, 106.81, 109.83;
c)
c. 100.75ms, 105.64, 109.21, 108.53, 107.83;
d)
d. 105.95ms, 104.81, 110.55, 108.53, 109.83;
30.
Câu 10 : sampleRTT 140, alpha 0.125, estimatedRtt 100ms, beta 0.25, devRtt 5ms
a)
a. 155ms
b)
b. 152ms
c)
c. 164ms
d)
d. 158ms
31.
Câu 11 : NextSeqNum += length(data)
a)
A.Sent out the next sequence number
b)
B.Set the sequences number fit to the length of data
c)
C.Set the sequence number to meet length data
d)
D. Set the sequence number to meet the expected number of next data to send
32.
Cau 12: In tcp, when receiver send a dup ACK?
a)
A.The sequence number of arrived package is not expected
b)
B.TCP fast retransmit
c)
C.A package is lost and need to resend it
d)
D.Sender receivers a corrupted package
33.
Cau 13 : TCP flow is created to ?
a)
A.Prevent overflowing
b)
B.Prevent receiver buffer to be busted
c)
C.Prevent congestion
d)
D.Prevent routers to transfer too fast
34.
Câu 16 : can tcp consider fair ?
a)
A.yes, because every one can transfer using tcp
b)
B.yes, because the throughput is roughly the same for every computer in network
c)
C. yes, because the throughput is roughly the same for every tcp connection
d)
D. no, because no one control tcp
35.
Câu 17 : Why we need RDT 3.0
a)
A.Since the package can be computed
b)
B.Since the package can be lost
c)
C.Since the ACK can be corrupted
d)
D.Since we can not always trust the ACK
36.
Câu 18 : How we know if a package is lost
a)
A.No way to know
b)
B.We receive a message on the lost of each package
c)
C.We know that a package is lost due to a special field in the tcp message
d)
D.The timer runout
37.
Câu 19 : how transfer fast in network
a)
A.Use udp
b)
B.Use tcp fast retransmit
c)
C.Increase computer’s coumputing power
d)
D.Use http
38.
Câu 1: The network layer is concerned with __________ of data.
a)
A.bits
b)
B.frame
c)
C.datagrams
d)
D.bytes
39.
Câu 2: Which one of the following is not a function of the network layer?
a)
A.routing
b)
B.inter-networking
c)
C.congestion control
d)
D.error control
40.
Câu 3: The 4-byte IP address consists of __________
a)
A.only network address
b)
B.only host address
c)
C.network address & host address
d)
D.network address & MAC address
41.
Câu 4: Which of the following routing algorithms can be used for network layer design?
a)
A.shortest path algorithm
b)
B.distance vector routing
c)
C.link-state routing
d)
D.all of the mentioned
42.
Câu 5: The network layer contains which hardware devices?
a)
A.Routers
b)
B.Routers and switches
c)
C.Routers, switches, firewall
d)
D.Routers, switches, firewalls, bridges
43.
Câu 6: Network layer protocol exits in...
a)
A.Hosts
b)
B.Switches
c)
C.Packets
d)
D.Bridges
44.
Câu 7: The network layer responds to requests from which layers?
a)
A.Transport layer
b)
B.Data layer
c)
C.Application layer
d)
D.Link layer
45.
Câu 8: RIP stands for
a)
A.Reduced Information Protocol
b)
B.Routing Internet Protocol
c)
C.Routing Information Protocol
d)
D.Reduced Internet Protocol
46.
Câu 9: The IPv4 header size
a)
A.is 20 to 60 bytes long
b)
B.is 20 bytes long
c)
C.is 60 bytes long
d)
D.none of the above
47.
Câu 10: In IPv4, when a datagram is encapsulated in a frame, the total size of the datagram must be less than the __________
a)
A.MUT
b)
B.MAT
c)
C.MTU
d)
D.None of the above
48.
Câu 11: IPv6 allows __________ security provisions than IPv4
a)
A.more
b)
B.less
c)
C.the same level
d)
D.None of the above
49.
Câu 12: What is the use of subnetting?
a)
A.It divides one large network into several smaller ones
b)
B.It divides the network into network classes
c)
C.It speeds up the speed of network
d)
D.None of above
50.
Câu 13: The combination of _________ and __________ is often termed the local address of the local portion of the IP address.
a)
A.Network number and host number
b)
B.Network number and subnet number
c)
C.Subnet number and host number
d)
D.Host number and IP address
51.
Câu 14: If an Ethernet port on a router were assigned an IP address of 172.16.112.1, what would be the valid subnet address of this host?
a)
A.172.16.112.0/25
b)
B.172.16.0.0/25
c)
C.172.16.96.0/24
d)
D.172.16.255.0/24
52.
Câu 15: You have an interface on a router with an IP address of 192. 168.192.10/29. Including the router interface, how many hosts can have IP addresses on the LAN attached to the router interface?
a)
A.6
b)
B.8
c)
C.30
d)
D.32
53.
Câu 16: What is the maximum number of IP addresses that can be assigned to hosts on a local subnet that uses the 255.255.255.224 subnet mask?
a)
A.14
b)
B.15
c)
C.16
d)
D.30
54.
Câu 17: You need to configure a server that is on the subnet 192.168.19.24/29. The router has the first available host address. Which of the following should you assign to a host in this subnet?
a)
A.192.168.19.0 255.255.255.0
b)
B.193.168.19.33 255.255.255.240
c)
C.192.168.19.26 255.255.255.248
d)
D.195.168.19.31 255.255.255.248
55.
Câu 18: Which value, that is contained in an IPv4 header field, is decremented by each router that receives a packet?
a)
A.Differentiated Services
b)
B.Fragment Offset
c)
C.Header Length
d)
D.Time-to-Live
56.
Câu 19: What kinds of information does NAT change?
a)
A.Port numbers
b)
B.Port numbers and IP addresses
c)
C.IP addresses
d)
D.Socket addresses
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