Which two commands allow you to return to a previous verision of software on the device?（）

A

request sytem software add

B

request sytem software downgrade

C

request sytem software replace

D

request sytem software rollback

Which command at the [edit protocols isis] hierarchy level forces routed traffic to avoid this router?（）

A、metric 64

B、overload

C、priority 0

D、te-metric 32768

通常变压器生产需要用匝线，电流这些导线，流过产生损耗。（）

A、铁损

B、铜损

C、功率损耗

D、电流损耗

电缆进局应从不同的方向引入，对于大型局（万门局以上）应至少有（）进局方向。为了提高管道管孔的含线率，进局电缆应采用大容量电缆。

A、一个

B、两个

C、三个

D、四个

In which three ways are C-BGP and E-BGP sessions similar?（）

Both are configured as type external.

Both configurations use the peer-as command.

Neither advertises the local-preference attribute.

Both set next-hop self when advertising routes to peers.

Both modify the AS-path attribute when advertising routes.

下列各项中，不符合急性细菌性痢疾临床表现的是（）

A、急性起病

B、腹痛、腹泻

C、里急后重

D、右下腹压痛

E、肠鸣音亢进