UDP belongs to ______ of the OSI reference model .
A . Network layer
B . Transport layer
C . Session layer
D . Presentation layer
Answer: B
Connect two switches with an Ethernet cable, and the MDI type of the interconnection port is configured as across , then this Ethernet cable should be ________ .
Connect two switches with an Ethernet cable, and the MDI type of the interconnection port is configured as across , then this Ethernet cable should be ________ .
A . Only use crossover cables
B . Only use direct-connect cables
C . Both parallel and crossover cables can be used
D . Neither parallel network cable nor cross network cable
Answer: A
Explanation:
Cross line of equipment on the same layer, straight lines on different layers
Ethernet switch interface type MDI / MDIX adaptive
MDI straight line
MDIX crossover
Here is set to MDI , only cross lines
Connect two switches with an Ethernet cable, and the MDI type of the interconnection port is configured as across , then this Ethernet cable should be ________ .
Connect two switches with an Ethernet cable, and the MDI type of the interconnection port is configured as across , then this Ethernet cable should be ________ .
A . Only use crossover cables
B . Only use direct-connect cables
C . Both parallel and crossover cables can be used
D . Neither parallel network cable nor cross network cable
Answer: A
Explanation:
Cross line of equipment on the same layer, straight lines on different layers
Ethernet switch interface type MDI / MDIX adaptive
MDI straight line
MDIX crossover
Here is set to MDI , only cross lines
The following statement about the IP address is correct ______ . (Multiple choices)
The following statement about the IP address is correct ______ . (Multiple choices)
A . The IP address consists of two parts: the network number and the host number
B . The first byte of class A address is 0 ~ 126 ( 127 is reserved for other purposes)
C . IP addresses are usually expressed in dotted decimal format, for example: 10.110.168.121
D . An IP address with a binary number of 1 in the host number is called a network address, and is used to identify all hosts on a network
Answer: AC
Explanation:
The first byte of class A address is 1 ~ 126
The following statement about the IP address is correct ______ . (Multiple choices)
The following statement about the IP address is correct ______ . (Multiple choices)
A . The IP address consists of two parts: the network number and the host number.
B . The network number of a class A IP address has 8 digits, and the actual variable digits are 7 digits.
C . Class D IP addresses are usually used as multicast addresses.
D . Address translation ( NAT ) technology is usually used to resolve the translation of class A addresses to class C addresses.
Answer: ABC
Explanation:
The first 8 -bit 110 starting NAT of class C addresses is used for private network address to public network address translation, regardless of address type
Here on OSI statement reference functions of each model error is ______ .
Here on OSI statement reference functions of each model error is ______ .
A . The physical layer involves the original bit stream transmitted on the communication channel ( Channel ), which defines the mechanical, electrical functions, and regulations required to transmit data.
B . The network layer determines the best route for transmitting packets. The key issue is to determine how the data packets are routed from the source to the destination.
C . The basic function of the transport layer is to establish and maintain virtual circuits, perform error checking and flow control.
D . The session layer is responsible for data format processing and data encryption.
E . The application layer is responsible for providing network services for applications.
Answer: D
Explanation:
A company that establishes a company network needs to connect to a wide area network. The bandwidth of the connection is required to be greater than 1Mbps . Which of the following interfaces and protocols are available ? (Multiple choice)
A company that establishes a company network needs to connect to a wide area network. The bandwidth of the connection is required to be greater than 1Mbps . Which of the following interfaces and protocols are available ? (Multiple choice)
AV35 protocol interface and cable, using PPP as the link layer protocol
BV35 protocol interface and cable, using Frame Relay as the link layer protocol
C. PRI interface and cable, bundle multiple time slots, use PPP as the link layer protocol
D. BRI interface and cable, bundle multiple time slots, use PPP as the link layer protocol.
Answer: ABC
Explanation:
V . 24 Support same and asynchronous: asynchronous maximum rate 115kbps synchronous maximum rate 64kbps
V . 35 only supports synchronization: the highest rate is 2048000bps = 2Mbps
Two access methods of ISDN :
BRI interface → 2B + DB channel 64kbps D channel 16kbps maximum rate 144kbps
PRI interface → E1 30B + D maximum rate 2Mbps T1 23B + D maximum rate 1.544Mbps
The following statement about the IP address is correct ______ . (Multiple choices)
The following statement about the IP address is correct ______ . (Multiple choices)
A . The first byte of class A address is 0 ~ 126 ( 127 is reserved for other uses)
B . An IP address with a binary zero in the host number part is called a network address and is used to identify all hosts on a network.
C . IP addresses are usually expressed in dotted decimal format, for example: 10.110.168.121
D . The IP address consists of two parts: the network number and the host number
Answer: BCD
The following description of circuit switching and packet switching is correct ______ . (Multiple choices)
The following description of circuit switching and packet switching is correct ______ . (Multiple choices)
A . Low utilization of packet-switched network resources
B . Large packet switching delay and poor real-time transmission
C . High utilization of circuit-switched network resources
D . Small circuit-switching delay and strong real-time transmission
Answer: BD
Which of the following options describe the parameters that can uniquely determine a TCP connection ?
Which of the following options describe the parameters that can uniquely determine a TCP connection ?
A . Source port number, source IP address
B . Destination port number, destination IP address
C . Source port number, destination port number
D . Source MAC address, destination MAC address
E . None of the above
Answer: E
Explanation:
The source IP address, source port, destination IP address, and destination port make up a socket, which uniquely determines a TCP connection