A.IP addressing design plans so that the network can be……

单项选择题Cat6500（config）# router ospf 1  Cat6500（config-router）# network 0.0.0.0 255.255.255.255 area 0  Cat6500（config-router）# nsf Cat6500（config-router）#end  Refer to the exhibit. The configuration is used to enable nonstop forwarding for OSPF on a Catalyst 6500 Series  Switch with redundant supervisor engines.  The default CEF configuration is unchanged. After testing， user traffic is interrupted and NSF is not operational.  What is the most likely reason？ （）

A.CEF was not properly configured.
B.OSPF was not properly configured for graceful restart.
C.Stateful switchover was not correctly configured.
D.NSF for OSPF is only supported in area 0.

单项选择题To initiate testing，  which port does a Cisco IOS IP SLA source use to send a control message to an IP SLA responder？ （）

A.UDP port 2020
B.UDP port 1967
C.TCP port 2020
D.ICMP port 1967

多项选择题WhichtwoitemsbestdescribeaCiscoIOSIPSLAresponder？（）

A.required at the destination to implement Cisco IOS IP SLA services
B.improves measurement accuracy
C.required for VoIP jitter measurements
D.provides security on Cisco IOS IP SLA messages via LEAP or EAP-FAST authentication
E.responds to one Cisco IOS IP SLA operation per port
F.stores the resulting test statistics

多项选择题WhichtwostatementsbestdescribeCiscoIOSIPSLA？（）

A.only implemented between Cisco source and destination-capable devices
B.statistics provided by syslog， CLI， and SNMP
C.measures delay， jitter， packet loss， and voice quality
D.only monitors VoIP traffic flows
E.provides active monitoring
F.provides passive monitoring

单项选择题Whichitemisthemostimportantfactorduringdeploymentofhigh-availabilityfeatures？（）

A.Test major changes before deployment and defer minor changes until during deployment. 
B.Document and verify rollback procedures.
C.Ensure consistency of code versions across the network.
D.Progressively modify procedures and documentation during implementation.