城域以太网在各个用户以太网之间建立多点第二层连接，IEEE802.1ah宣言的运营商主干网桥协议提供的基本技术是在用户以太帧中再封装一层（本题），这种技术被称为（下题）技术。
- A.运营商的MAC帧头
- B.运营商的VLAN标记
- C.用户的VLAN标记
- D.用户帧类型标记
正确答案及解析
正确答案
解析
见下题
你可能感兴趣的试题
Unified Modeling Language（UML） is a widely used method of visualizing and documenting an information system. The UML can be used to develop（ 71 ）, in which an object represents a person, place, event, or transaction that is significant to the information system. Systems analysts define an object's attributes during the（ 72 ）. An object also has（ 73 ）which are tasks or functions that the object performs when it receives a message, or command, to do so. A（n）（ 74 ）is a group of similar objects. If objects are similar to nouns, attributes are similar to adjectives that describe the characteristics of an object. Objects can have a specific attribute called a（n）（ 75 ）, which of an object is an adjective that describes the object's current status. All objects within a class share common attributes and methods, so a class is like a blueprint, or template for all the objects within the class.
-
- A.state
- B.constant
- C.instance
- D.member
- 查看答案
Unified Modeling Language（UML） is a widely used method of visualizing and documenting an information system. The UML can be used to develop（ 71 ）, in which an object represents a person, place, event, or transaction that is significant to the information system. Systems analysts define an object's attributes during the（ 72 ）. An object also has（ 73 ）which are tasks or functions that the object performs when it receives a message, or command, to do so. A（n）（ 74 ）is a group of similar objects. If objects are similar to nouns, attributes are similar to adjectives that describe the characteristics of an object. Objects can have a specific attribute called a（n）（ 75 ）, which of an object is an adjective that describes the object's current status. All objects within a class share common attributes and methods, so a class is like a blueprint, or template for all the objects within the class.
-
- A.actor
- B.instance
- C.component
- D.class
- 查看答案
Unified Modeling Language（UML） is a widely used method of visualizing and documenting an information system. The UML can be used to develop（ 71 ）, in which an object represents a person, place, event, or transaction that is significant to the information system. Systems analysts define an object's attributes during the（ 72 ）. An object also has（ 73 ）which are tasks or functions that the object performs when it receives a message, or command, to do so. A（n）（ 74 ）is a group of similar objects. If objects are similar to nouns, attributes are similar to adjectives that describe the characteristics of an object. Objects can have a specific attribute called a（n）（ 75 ）, which of an object is an adjective that describes the object's current status. All objects within a class share common attributes and methods, so a class is like a blueprint, or template for all the objects within the class.
-
- A.methods
- B.interactions
- C.interfaces
- D.behaviors
- 查看答案
Unified Modeling Language（UML） is a widely used method of visualizing and documenting an information system. The UML can be used to develop（ 71 ）, in which an object represents a person, place, event, or transaction that is significant to the information system. Systems analysts define an object's attributes during the（ 72 ）. An object also has（ 73 ）which are tasks or functions that the object performs when it receives a message, or command, to do so. A（n）（ 74 ）is a group of similar objects. If objects are similar to nouns, attributes are similar to adjectives that describe the characteristics of an object. Objects can have a specific attribute called a（n）（ 75 ）, which of an object is an adjective that describes the object's current status. All objects within a class share common attributes and methods, so a class is like a blueprint, or template for all the objects within the class.
-
- A.systems maintenance process
- B.systems implementation process
- C.systems design process
- D.systems testing process
- 查看答案
Unified Modeling Language（UML） is a widely used method of visualizing and documenting an information system. The UML can be used to develop（ 71 ）, in which an object represents a person, place, event, or transaction that is significant to the information system. Systems analysts define an object's attributes during the（ 72 ）. An object also has（ 73 ）which are tasks or functions that the object performs when it receives a message, or command, to do so. A（n）（ 74 ）is a group of similar objects. If objects are similar to nouns, attributes are similar to adjectives that describe the characteristics of an object. Objects can have a specific attribute called a（n）（ 75 ）, which of an object is an adjective that describes the object's current status. All objects within a class share common attributes and methods, so a class is like a blueprint, or template for all the objects within the class.
-
- A.database models
- B.object models
- C.event models
- D.static system models
- 查看答案