Which statement about IP routing statement is true?
- A . Routing is the concept of the second layer in the OSI model.
- B . Any of the routing must include the following three parts information: source address, destination address and next hop.
- C . In the LAN, routing includes the following two parts content: IP address and MAC address.
- D . IP routing is the path information of guiding IP packet forwarding.
Which is the next generation development prospect of access network ?
- A . to expand application of PSTN
- B . increase transmission business types on the ADSL
- C . Light into the copper
- D . improve ADSL transmission distance, increase coverage radius
Which of the following does not belong to the scope of the communication network?
- A . Telephone Network
- B . Internet Network
- C . Radio and Television Network
- D . National Grid
In the access network access technology, which of the following access method can provide maximum access bandwidth?
- A . ADSL
- B . ADSL 2+
- C . VDSL
- D . GPON
ICMP is a link layer protocol, ICMP message is triggered by the physical layer, and then respond by IP layer or a higher layer protocol.
- A . True
- B . False
Routing in the routing table can not exist mask of 0.0.0.0 routing entry.
- A . True
- B . False
In the routing table item, for the same destination address and mask, only corresponding to a unique nexthop and outbound interface.
- A . True
- B . False
MAC address is composed of 48 bit, usually showed in 12 hexadecimal, the first six hexadecimal digits by the IEEE in charge of unified distribution, used to determine the uniqueness of the manufacturers, the last six hexadecimal digits by the manufacturers responsible for their own management.
- A . True
- B . False
TTL is mainly to prevent IP packet loop forwarding in the network, wasting network bandwidth.
- A . True
- B . False
Link layer defines the electrical, mechanical process and function, to realize line activation, keeping and demolition on both ends of system connection.
- A . True
- B . False
Which layer of the OSI model does the router manly work in ?
- A . Physical Layer
- B . Link Layer
- C . Network layer
- D . Transport Layer
Part of the field in the IP packet is dedicated to the description of the life cycle of the message, that is TTL value, how much is its maximum value ?
- A . 255
- B . 256
- C . 1023
- D . 1024
LAN is generally transmitted in the form of bus-based, the most commonly used protocol is carrier sense and collision detection CSMA/CD protocol.
- A . True
- B . False
Ethernet technology is a widely used technology, according to the different transmission rate, there are three classes of 10M, 100M, 1000M, including 10M and 100M Ethernet transmission medium is commonly used for twisted pair, but due to high speed of 1000M Ethernet ,the transmission medium must use optical fiber.
- A . True
- B . False
LAN computers in judging the received broadcast frame is the method whether they should receive, judge whether the source MAC address of the frame is the same as the hardware address of the machine.
- A . True
- B . False
MAC address is usually purchased by each manufacturer from IEEE, but can also be specified on their own.
- A . True
- B . False
MAC address of computer network card is unified assigned to each manufacturer by IETF, globally unique.
- A . True
- B . False
Fast Ethernet standard rate has 100Base-TX, 100Base-T4 and 100Base-FX.
- A . True
- B . False
In Ethernet, according to what address to distinguish the different devices?
- A . LLC address
- B . MAC address
- C . IP address
- D . IPX address
Which layer of the OSI reference model does Ethernet switches work in ?
- A . Physical Layer
- B . Data link layer
- C . Network layer
- D . Transport Layer