在本次调查中,平均每个中心的中级以上职称在岗职工有多少人？()

A.Traceroute transmits ICMP echo-request packets.

B.Traceroute transmits UDP packets.

C.Traceroute receives ICMP echo-reply packets.

D.Traceroute receives ICMP port-unreachable packets.

A．(i) only

B．(ii) only

C．Both of them

D．Neither of them

A.The Routing Engine handles all exception traffic.

B.The Routing Engine synchronizes the route table with the PFE

C.The Routing Engine is hot-pluggable.

D.The Routing Engine controls the PFE

A.RSTP cannot operate with PVST+.

B.RSTP defines new port roles.

C.RSTP defines no new port states.

D.RSTP is a proprietary implementation of IEEE 802.1D STP.

E.RSTP is compatible with the original IEEE 802.1D STP.

A. LDP uses Down Stream On Demand.

B. RSVP uses Down Stream On Demand.

C. LDP uses Down Stream Unsolicited.

D. RSVP uses Down Stream Unsolicited.

A. RSTP cannot operate with PVST+.

B. RSTP defines new port roles.

C. RSTP defines no new port states.

D. RSTP is a proprietary implementation of IEEE 802.1D STP.

E. RSTP is compatible with the original IEEE 802.1D STP.

A. Routers maintain a single link-state database per area.

B. Routers maintain a separate Level 1 link-state database.

C. Routers maintain a separate Level 2 link-state database.

D. Routers maintain a single Level 1 link-state database across multiple areas.

A、Statements I and II are correct

B、Statements II, III and IV are correct

C、Statements II and IV are correct

D、Only statement IV is correct

E、Statements I and III are correct

A. Flashback Table can be performed on system tables.

B. Flashback Table operation does not shrink the segments.

C. Flashback Table uses log mining to extract SQL_REDO and SQL_UNDO statements.

D. Flashback Table operation acquires exclusive data manipulation language (DML) locks.

A.OSPF has a single preference value for both internal and external routes.

B.RIP is preferred over OSPF external routes.

C.Direct, local, and static routes have the same preference value.

D.OSPF‘s preference value is lower than BGP (both IBGP and EBGP).