2. 计算机
  3. Which of following VLAN frame encapsulation types are configurable on a Cisco switch? (Select two answer choices.) A. VTP B. 802

Which of following VLAN frame encapsulation types are configurable on a Cisco switch? (Select two answer choices.) A. VTP B. 802

admin2009-05-19  14
问题 Which of following VLAN frame encapsulation types are configurable on a Cisco switch? (Select two answer choices.)
A. VTP
B. 802.1Q
C. LLC
D. ISL
E. CDP
F. PAP
选项
答案B,D
解析 Explanation:
ISL and 802.1Q are the two trunking encapsulations that can be configured on a Cisco switch. ISL is Cisco proprietary and 802.1Q is the IEEE standard method.

Incorrect Answers:
A. VTP is the VLAN Trunking Protocol, which is used to carry VLAN information across the trunks. The question is asking for the encapsulation options for the trunk, which will be used by VTP.

C. LLC is the Logical Link Control, which is a sub-layer of the data link layer.

E. CDP is the Cisco Discovery Protocol, which is used by Cisco devices to discover information on neighboring Cisco devices.

F. PAP is the Password Authentication Protocol, which is used as an authentication mechanism on PPP links.
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