| (+10) |
(10%) 1. What happens when a member of a VLAN A sends a broadcast frame ? (多選)
| |
| (a)The frame will be forwarded to all the stations in the bridged LAN. | ||
| (b)The frame will be forwarded to the Internet by the routers connected to the bridged LAN. | ||
| (c)The frame will be forwarded to all the stations in the VLAN A. | ||
| (d)The frame will be filtered by the routers connected to the bridged LAN. | ||
| (e)The frame will be forwarded to all the stations in the VLAN A and VLAN B, where VLAN A and VLAN B are in the same switch. | ||
| (+10) |
(10%) 2. Which of the following statements are correct for a port-based VLAN configuration ? Assume the port VID (PVID) of port x is 10 and a frame is received from port x. (多選)
| |
| (a) If the frame is untagged, then the VID of the frame will be 10. | ||
| (b) If the frame is already tagged with a VID = 20, then the VID of the frame will be changed to 10. | ||
| (c) If the frame is already tagged with a VID = 20, then the VID of the frame will be 20 | ||
| (d) Any station directly connects to port x will belong to VLAN 10. | ||
| (e) If a “hub” is connected to port x, then all the stations connected to this hub will belong to VLAN 10. | ||
| (+10) |
(10%) 3. Consider the following port-based VLAN configuration with 3 bridges/switches. Which of the following statements are correct ? (多選)
 | |
| (a) Both the links connecting (bridge 1, bridge 2) and (bridge 1, bridge 3) are trunk link. | ||
| (b) When a station of VLAN 3 sends a broadcast frame, the frame will be processed by bridge 1 and bridge 3. | ||
| (c) When a station of VLAN 3 sends a broadcast frame, the frame will be processed by all the three bridges. | ||
| (d) When a station of VLAN 2 sends a broadcast frame, the frame will also be processed by bridge 1 and bridge 3. | ||
| (e) When a station of VLAN 1 sends a broadcast frame, the frame will also be processed by all the three bridges. | ||
| (+10) |
(10%) 4. Which of the following tagging rules for a “trunk link” are correct ?
| |
| (a) All frames traversing a trunk link must be untagged. | ||
| (b) All frames traversing a trunk link must be tagged. | ||
| (c) There can be a mix of implicitly and explicit tagged frames in a trunk link but they must be for different VLANs. | ||
| (d) For each VLAN, all frames traversing a trunk link must be tagged the same way: all implicitly tagged or all carrying the same explicit tag. | ||
| (e) A frame traversing a trunk link will be tagged or untagged depends on which VLAN the frame came from. | ||
| (+10) |
(10%) 5. Which of the following tagging rules for a “hybrid link” are correct ? (多選)
| |
| (a) For each VLAN, all frames traversing a particular hybrid link must be tagged the same way: all implicitly tagged or all carrying the same explicit tag. | ||
| (b) For each VLAN, all frames traversing a particular hybrid link can be tagged in different ways. | ||
| (c) All the frames must be tagged explicitly. | ||
| (d) There can be a mix of implicitly and explicit tagged frames but they must be for different VLANs. | ||
| (e) A frame traversing a particular hybrid will be tagged or untagged depends on which VLAN the frame came from. | ||
| (+10) |
(10%) 6. Consider the following VLAN configuration. Assume that all stations are VLAN unaware. Which of the following statements are correct ? (多選)
 | |
| (a) All frames of VLAN A and VLAN B will be tagged when traversing the hybrid link. | ||
| (b) All frames of VLAN C will be untagged when traversing the hybrid link. | ||
| (c) All frames of VLAN A, VLAN B and VLAN C will be tagged when traversing the hybrid link. | ||
| (d) All frames of VLAN C will be tagged when traversing the hybrid link. | ||
| (e) All frames of VLAN B and VLAN C will be untagged when traversing the hybrid link. | ||
| (+10) |
(10%) 7. Which of the following statements about the relationship between VLAN and spanning tree are correct ? (多選)
| |
| (a) The set of paths to connect the members of a VLAN is a subset of the spanning tree of the bridged LAN. | ||
| (b) The set of paths to connect the members of a VLAN is dynamic. | ||
| (c) The set of paths to connect the members of different VLANs may be different. | ||
| (d) The set of paths to connect the members a VLAN always is identical to the spanning tree of the bridged LAN. | ||
| (e) The set of paths to connect the members of a VLAN is fixed. | ||
| (+24) |
(24%) 8. Consider the following VLAN configuration. For switch 3, what are the “member set” and “untagged set” of each VLAN ? please answer the port “number” for each of the following questions. Use “0” to indicate an empty set. (每空格兩分，PS:答案數字之順序請由小到大排列)
Member set:
VLAN1:__(1)___,
VLAN2:__(2)___, __(3)___, __(4)___
VLAN3:__(5)___, __(6)___, __(7)___,
Untagged set:
VLAN1:_(8)_
VLAN2:__(9)___, __(10)___
VLAN3:__(11)___, __(12)___
 | |
| (1) | ANS:1 | |
| (2) | ANS:1 | |
| (3) | ANS:9 | |
| (4) | ANS:11 | |
| (5) | ANS:1 | |
| (6) | ANS:4 | |
| (7) | ANS:6 | |
| (8) | ANS:0 | |
| (9) | ANS:9 | |
| (10) | ANS:11 | |
| (11) | ANS:4 | |
| (12) | ANS:6 | |
| (+6) |
(6%) 9. What is the maximum number of VLANs allowed in a bridged LAN ?
| |
| (a) 512 | ||
| (b) 4096 | ||
| (c) 2048 | ||
| (d) 1024 | ||
| (e) 8192 | ||
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