单选题Which of these statements about PIM join messages in classic PIM-SM is correct？（）APIM join messages are sent every 60 seconds to refresh the upstream router’s mroute state for the multicast tree.BRouters send a PIM join acknowledgement in response to each PIM join message received from a downstream router.CPIM join messages are only sent when the multicast distribution tree is first being established.DPIM join messages are sent every three minutes to refresh the upstream router’s mroute state for the multicast tree.
单选题
Which of these statements about PIM join messages in classic PIM-SM is correct？（）
A
PIM join messages are sent every 60 seconds to refresh the upstream router’s mroute state for the multicast tree.
B
Routers send a PIM join acknowledgement in response to each PIM join message received from a downstream router.
C
PIM join messages are only sent when the multicast distribution tree is first being established.
D
PIM join messages are sent every three minutes to refresh the upstream router’s mroute state for the multicast tree.
参考解析
解析：
暂无解析
相关考题：
Which two statements are true about Internet Group Management Protocol (IGMP) snooping?() A. IGMP snooping and Cisco Group Membership Protocol (CGMP) can be used simultaneously on a switch.B. IGMP snooping a nd Cisco Group Membership Protocol (CGMP) were developed to help Layer 3 switches make intelligent forwarding decisions on their own.C. IGMP snooping examines IGMP join/leave messages so that multicast traffic is forwarded only to hosts that sent an IG MP message toward the router.D. IGMP snooping is an IP multicast constraining mechanism for Layer 2 switches.E. IGMP snooping is enabled with the ip multicast - routing global configuration command.
Which two of these statements correctly describe classic PIM-SM？（）A、The IOS default is for a last-hop router to trigger a switch to the shortest path tree as soon as a new source is detected on the shared tree.B、The IOS default is for every one of the routers on the shared tree to trigger a switch to the shortest path tree as soon as a new source is detected on the shared tree.C、The default behavior of switching to the shortest path tree as soon as a new source is detected on the shared tree can be disabled by setting the value in the ip pim spt-threshold command to "infinity."D、The default behavior of switching to the shortest path tree as soon as a new source is detected on the shared tree can be disabled by setting the value in the ip pim spt-threshold command to "zero."
Which two statements are true regarding the USING clause in table joins?（）A、It can be used to join a maximum of three tables B、It can be used to restrict the number of columns used in a NATURAL join C、It can be used to access data from tables through equijoins as well as nonequijoins D、It can be used to join tables that have columns with the same name and compatible data types
Which three statements about bidirectional PIM are true？（）A、Traffic for a bidirectional group flows along the one shared tree and simultaneously utilizes multiple paths in a redundant network topologyB、It does not require any traffic signaling in the protocolC、Membership to a bidirectional group is signaled using explicit Join messagesD、It maintains source-specific forwarding stateE、It reduces memory， bandwidth， and CPU requirements
Which three statements are true about IP multicast configuration?（）A、PIM sparse - dense mode and PIM dense mode require an RP on the network.B、PIM sparse mode and PIM dense mode require an RP on the network.C、PIM sparse mode interfaces are always added to the multicast routing table in a router.D、PIM sparse mode and PIM sparse - dense mode require an RP on the network.E、PIM dense mode interfaces are always added to the multicast routing table in a router.F、PIM sparse - dense mode acts as PIM dense mode if an RP is not known.
Which three statements about Syslog utilization are true?（）A、Utilizing Syslog improves network performance.B、The Syslog server automatically notifies the network administrator of network problems.C、A Syslog server provides the storage space necessary to store log files without using router disk space.D、There are more Syslog messages available within Cisco IOS than there are comparable SNMP trap messages.E、Enabling Syslog on a router automatically enables NTP for accurate time stamping。F、A Syslog server helps in aggregation of logs and alerts.
Which two statements are tru e about the rendezvous point (RP) in a multicast network?（）A、The multicast sources must register with the RP to form the multicast distribution treeB、An RP is required only in networks running Protocol Independent Multicast dense mode ( PIM DM)C、The multicast receivers must register with the RP to form the multicast distribution treeD、An RP is required only in networks running Protocol Independent Multicast sparse mode (PIM SM)E、An RP is required only in networks running Pro tocol Independent Multicast sparse - dense mode (PIM - SDM)F、To form the multicast distribution tree, the multicast sources register with and the receivers join the RP
Which two statements about views are true? （）A、A view can be created as read only.B、A view can be created as a join on two or more tables.C、A view cannot have an ORDER BY clause in the SELECT statement.D、A view cannot be created with a GROUP BY clause in the SELECT statement.E、A view must have aliases defined for the column names in the SELECT statement.
Overlay Transport Virtualization （OTV） join interface is used to source the OTV encapsulated traffic and send it to the Layer 3 domain of the data center network. Which statements are true about OTV join interface？ （）A、 Join interface is a Layer 3 entity， and with the Cisco NX-OS release 6.0， it can only be defined as a physical interface， physical subinterface， Layer 3 port channel， or Layer 3 port channel subinterface.B、 A single join interface can be defined and associated with a given OTV overlay.C、 Multiple overlays can also share the same join interface.D、 Join interface can be a loopback interface.E、 The join interface is a Layer 3 entity that can be defined as a physical interface but not as a logical one.
Which two statements are true about traffic shaping？（）A、Out-of-profile packets are queued.B、It causes TCP retransmits.C、Marking/remarking is not supported.D、It does not respond to BECN and ForeSight Messages.E、It uses a single/two-bucket mechanism for metering.
Which two statements about RPF checks in Multicast Source Discovery Protocol （MSDP） are true？（）A、It prevents message looping， Session Advertisement （SA）messages must be RPF checkedB、RPF check should be done against the route to the source S of the corresponding PIM-SM domainC、RPF check should be done against the route to the Rendez-vous Point of the corresponding PIM-SM domain，which originated the SAD、RPF checking Session Advertisement （SA） messages will cause message looping
Which of these statements about PIM join messages in classic PIM-SM is correct？（）A、PIM join messages are sent every 60 seconds to refresh the upstream router’s mroute state for the multicast tree.B、Routers send a PIM join acknowledgement in response to each PIM join message received from a downstream router.C、PIM join messages are only sent when the multicast distribution tree is first being established.D、PIM join messages are sent every three minutes to refresh the upstream router’s mroute state for the multicast tree.
Which two statements are true about the Cisco Classic （CBAC） IOS Firewall set？（）A、It can be used to block bulk encryption attacksB、It can be used to protect against denial of service attacksC、Traffic originating from the router is considered trusted， so it is not inspectedD、Based upon the custom firewall rules， an ACL entry is statically created and added to theexisting ACL permanentlyE、Temporary ACL entries that allow selected traffic to pass are created and persist for theduration of the communication session
Which two statements are true about Internet Group Management Protocol (IGMP) snooping?（）A、IGMP snooping and Cisco Group Membership Protocol (CGMP) can be used simultaneously on a switch.B、IGMP snooping a nd Cisco Group Membership Protocol (CGMP) were developed to help Layer 3 switches make intelligent forwarding decisions on their own.C、IGMP snooping examines IGMP join/leave messages so that multicast traffic is forwarded only to hosts that sent an IG MP message toward the router.D、IGMP snooping is an IP multicast constraining mechanism for Layer 2 switches.E、IGMP snooping is enabled with the ip multicast - routing global configuration command.
Which two statements are true about the rendezvo us point (RP) in a multicast network?（）A、The multicast sources must register with the RP to form the multicast distribution tree.B、An RP is required only in networks running Protocol Independent Multicast dense mode (PIM DM).C、The mu lticast receivers must register with the RP to form the multicast distribution tree.D、An RP is required only in networks running Protocol Independent Multicast sparse mode (PIM SM).E、An RP is required only in networks running Protocol Independent Mu lticast sparse - dense mode (PIM - SDM).F、To form the multicast distribution tree, the multicast sources register with and the receivers join the RP.
Which of the following tools is used to view historical information about tasks, database changes, messages, and notifications?（）A、JournalB、Task CenterC、Control CenterD、Activity Monitor
Which two statements about the track configuration option are correct?（）A、The track option monitors interfaces as defined by the user.B、The track option monitors all interfaces participating in VRRP.C、The track option allows for a reduction of the priority value if the monitored interface goes down.D、The track option causes syslog entries to be written in the messages log file, if the monitored interface goes down.
多选题Which three statements about bidirectional PIM are true？（）ATraffic for a bidirectional group flows along the one shared tree and simultaneously utilizes multiple paths in a redundant network topologyBIt does not require any traffic signaling in the protocolCMembership to a bidirectional group is signaled using explicit Join messagesDIt maintains source-specific forwarding stateEIt reduces memory， bandwidth， and CPU requirements
多选题In relation to MPLS Multicast VPN， which three statements about multicast distribution （MDT） groups aretrue？ （）ADefault MDT groups are used for PIM control traffic， low-bandwidth sources， and flooding of sparse mode traffic.BMDTs are built in customer networksCData MDT groups are used for high-bandwidth sources to reduce replication to uninterested PEs.DMDTs are built in provider networksEThe number of MDTs depends on PIM modes of MDT groups.
多选题Overlay Transport Virtualization （OTV） join interface is used to source the OTV encapsulated traffic and send it to the Layer 3 domain of the data center network. Which statements are true about OTV join interface？ （）AJoin interface is a Layer 3 entity， and with the Cisco NX-OS release 6.0， it can only be defined as a physical interface， physical subinterface， Layer 3 port channel， or Layer 3 port channel subinterface.BA single join interface can be defined and associated with a given OTV overlay.CMultiple overlays can also share the same join interface.DJoin interface can be a loopback interface.EThe join interface is a Layer 3 entity that can be defined as a physical interface but not as a logical one.
单选题Which of the following statements about transmitting distress messages by radiotelephone is INCORRECT?（）AIf no answer is received on the designated distress frequencies，repeat the distress call on any frequency availableBChannel 16 (156.8) may be used for distress messagesCIt is advisable to follow a distress message on 2182 kHz by two dashes of 10 to 15 seconds durationDDistress messages should first be transmitted on 2182 kHz
多选题Which two statements are true about the rendezvo us point (RP) in a multicast network?（）AThe multicast sources must register with the RP to form the multicast distribution tree.BAn RP is required only in networks running Protocol Independent Multicast dense mode (PIM DM).CThe mu lticast receivers must register with the RP to form the multicast distribution tree.DAn RP is required only in networks running Protocol Independent Multicast sparse mode (PIM SM).EAn RP is required only in networks running Protocol Independent Mu lticast sparse - dense mode (PIM - SDM).FTo form the multicast distribution tree, the multicast sources register with and the receivers join the RP.
多选题Which two statements about SA caching are true？（）ACaching allows pacing of MSDP messages.BCaching reduces join latency.CCaching should not be done by an MSDP speaker.DCaching is used to update the BGP MDT address family.
多选题Which two statements are true about traffic shaping？（）AOut-of-profile packets are queued.BIt causes TCP retransmits.CMarking/remarking is not supported.DIt does not respond to BECN and ForeSight Messages.EIt uses a single/two-bucket mechanism for metering.
多选题Which three statements are true about IP multicast configuration?（）APIM sparse - dense mode and PIM dense mode require an RP on the network.BPIM sparse mode and PIM dense mode require an RP on the network.CPIM sparse mode interfaces are always added to the multicast routing table in a router.DPIM sparse mode and PIM sparse - dense mode require an RP on the network.EPIM dense mode interfaces are always added to the multicast routing table in a router.FPIM sparse - dense mode acts as PIM dense mode if an RP is not known.