题目
: a router with the following routing table receives a packet with destination 108.9.51.43. Which interface should the router forward the packet to?
0
With a checksum of 29, which of the following binary numbers is the correct checksum byte?
00011101
Which of the following is the decimal value of the hexadecimal number 74?
116
what is the broadcasting address of the subnet for IP address 128.196.40.16 and subnet mask 255.255.255.128?
128.196.40.127
what is the broadcasting address of the subnet for IP address 128.196.40.196 with subnet mask 255.255.255.128?
128.196.40.255
Which of the following is an invalid IP address?
192.168.0.512
In the following network, if my IP is 192.168.8.2, what is the path that I can reach 192.168.128.16?
192.168.8.2 => R2 => R1 => 192.168.128.16 12-16
R1 below receives a packet with destination address 192.168.16.120. Which row from the routing table will be invoked?
2 12-17
Which of the following is most likely to be a MAC address?
23.4F.17.8A.4C.10
A sender transmits a TCP packet with 200 bytes of data with sequence number 2400. The other side receives the packet and piggybacks an ACK in a data packet with sequence number 2800. Assume no other data packets have been sent. What is the ACK number in the packet?
2600
If an organization is assigned the IP address 128.192.1.0/27, how many bits can the organization allocate for hosts?
5
Question: What's the percentage of time that Bipolar RZ encoding is transmitting data information?
50% 6-34
What is the transmission efficiency if you send 342 bytes data over Ethernet II (with 38 bytes of overhead)?
90%
The application layer in the OSI model is the same as the application layer in the Internet model.
?
The network layer is responsible for routing messages from the source computer to the destination computer.
?
If you have to send multimedia data over SMTP it has to be encoded into
ASCII
In DHCP, how does your computer choose an IP address?
Broadcast the request on the network
Which of the following would be a standard used at the Data Link layer of the Internet or OSI model?
Ethernet
All three parts (request line, request header, request body) of an HTTP request from a web browser to a web server are required when a request is made.
F
Fiber optic cable carries signals in traditional electrical form.
F
Full-Duplex is always better than Simplex transmission.
F
IP is responsible for error-free delivery of packets on a TCP/IP network.
F
In SSL, the public key that the server sends to the client in the negotiation phase (Step 2) is used to encrypt the application data.
F
In data transmission, data errors are uniformly distributed in time.
F
In simplex transmission, the data flows in both directions at the same time.
F
The Simple Mail Transfer Protocol is the least commonly used e-mail standard.
F
The network layer address for IP is ten bytes long when using IPv4.
F
The network layer is responsible for end-to-end delivery of the message.
F
The standard protocol for communication between a Web browser and a Web server is the web protocol.
F
Transmission efficiency refers to the percentage of bits transmitted without errors.
F
Using the POP standard for client to server e-mail communication, the e-mail messages remain on the server computer.
F
When using dynamic routing, routing decisions are always made by a central host or server.
F
Wireless media are more secure than guided media.
F
The following timeline is a correct reflection of the continuous ARQ on the left.
F 8-17
Which of the following is true about roll call polling?
It can not be modified to increase priority of clients or terminals. It does not require a server or special device that performs the polling. It is also called token passing. It is a type of contention approach to media access control. 都不对
Which of the following is not a virtue of the layered models?
It reduces overheads and increases efficiency
Which of the following statements about HTTPS is NOT correct:
It sends data in human readable text
which of the following is true about DNS resource record <mailgator.email.arizona.edu, 128.196.130.185, A>?
It shows the IP address of mailgator.email.arizona.edu
Which of the following is true?
POP3 can never keep a copy of email on the server. IMAP can not access the same email from different devices. POP3 keeps different clients synchronized. 都不对
SSL can be used to secure
POP3 traffic HTTP traffic SMTP traffic 都选
To learn a list of clients participating in a BitTorrent swarm, a BitTorrent client often
Requests them from a tracker
With which type of digital signaling does the signal always return to zero volts after each bit?
Return-to-zero signaling
Which of the following are functions of the Internet protocol?
Selecting the best path to send the data
If a server has no clue about where to find the address for a hostname then
Server asks the root server
Computers produce digital data whose values are binary: 0 or 1.
T
DHCP dynamically assign an IP address to a computer.
T
HTTPS can encrypt your credit card information so that it is protected.
T
Only the same website who saves information to a cookie can access it.
T
Routing is the process of determining the path through the network that a particular message will follow from the sender to the recipient.
T
Scalability refers to the ability to increase or decrease the capacity of the computing infrastructure in response to changing capacity needs.
T
Subnet masks tell computers what part of an IP address is to be used to determine whether a destination is in the same subnet or in a different subnet.
T
The data link layer accepts messages from the network layer and controls the hardware that transmits them.
T
The simplest method for error correction is retransmission
T
: Here is a screenshot of HTTP request. Which of the following is NOT correct
The connection is closed after the first connection
What parts does the NAT change when it translates the network address?
The private IP address The port number of the client 选上面连个
The TCP portion of TCP/IP performs linking to the application layer.
True
R1 below receives a packet with destination address 10.10.20.45. Which interface should it forward the packet to?
eth2 12-5
Stop-and-wait ARQ uses __________ type of data flow.
half duplex
An N-tiered architecture
is generally more "scalable" than a three-tier architecture
________ is not an important function of the transport layer.
routing
The source port identifier tells the destination station _____________.
which application layer process the packet is from.