2021儿科护理专业实践能力真题模拟04-17

1、Which statement correctly describes a wireless client Layer 2 roam from AP1 to AP2 while joined to a multicast stream using Cisco WLC running v5.2?（）（单选题）

A. Client issues an IGMP join after association with AP2, allowing AP2 to request a multicast stream from  Cisco WLC after AP1 issues an IGMP query.

B. Client issues an IGMP join after association with AP2, allowing AP2 to request a multicast stream from  Cisco WLC independent of AP1 multicast member status.

C. Client resumes multicast after association with AP2,  because multicast information is sent in mobility  exchanges and AP2 is already a member of the multicast group,  provided that another client has  already joined that multicast.

D. Client resumes multicast after association with AP2,  because multicast information is sent in mobility  exchanges and AP2 is already a member of the multicast group,  regardless if any other clients have  already joined that multicast.

试题答案：D

2、End-to-end QoS is maintained in the Cisco WLAN deployment model by utilizing what parameter in lieu of 802.1p？（）（单选题）

A.  IP precedence

B.  type of service （ToS）

C.  class of service （CoS）

D.  differentiated services code point （DSCP）

试题答案：D

3、When HSRP is configured on a network, which two of these items are provided, which are sharedbetween the routers that run HSRP? （）(Choose two.)（多选题）

A. TCP-based hello packets

B. the impact of flapping links if timers are too low

C. a shared single interface

D. the ability to track serial interfaces

E. UDP-based hello packets

试题答案：B,D

4、Routers R1 and R2, OSPF neighbors in area 0 over their Fa0/0 interfaces (respectively), currently both successfully use OSPF MD5 authentication. The OSPF configuration includes the area 0 authentication command under the router ospf 1 command. Which of the following commands must have been configur ed on R1's Fa0/0 interface?（）（多选题）

A. ip ospf authentication null

B. ip ospf authentication message - digest

C. ip ospf authentication -key whatever- it - is

D. ip ospf message - digest - key 1 md5 whatever - it - is

E. ip ospf md5 1 key whatever - it - is

试题答案：B,D

5、Which of the following statements are true for routers but not true for Layer 3 Ethernet switches？（Choose all that apply.）（）（多选题）

A. May have Ethernet as well as non-Ethernet interfaces

B. Traditionally used as a standalone device for inter-VLAN communication

C. Makes use of TCAMs

D. Uses subinterfaces to define trunks

E. Can use both Layer 2 and Layer 3 to make forwarding decisions

F. Allows the definition of Switched Virtual Interfaces（SVI）

试题答案：A,B,D