單項(xiàng)選擇題

There are three routers on a Gigabit Ethernet LAN: Router A, Router B, and Router C. Router A is the Designated Intermediate System (DIS) at Level 1 for that LAN. Router A's DIS priority is 64. The LAN is a Level 1-only link. Router D has just been powered up on that same LAN and its DIS priority is 80.
Which statement is true?（）

A. Router A remains the DIS and generates a new pseudonode LSP for that LAN
B. Router A remains the DIS and NO new pseudonode LSP is generated for that LAN
C. Router D becomes the new DIS, generates a new pseudonode LSP for that LAN, and purges the old pseudonode LSP generated by Router A
D. Router D becomes the new DIS, does NOT generate a new pseudonode LSP for that LAN, and does NOT purge the old pseudonode LSP generated by Router A

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What does the LSP Holdtime field in an IS-IS database indicate?（）

A. the LSP age
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An Intermediate System experiencing memory problems indicates that it may have incomplete data by setting which bit in its LSP?（）

A. more bit
B. partition bit
C. attached bit
D. overload bit