Which is true about OSPF router-id?（）

A . All CE devices emulate a bridge B . All provider devices emulate a bridge C . Hierarchical VPLS reduces signaling overhead D . Each PE device emulates a bridge E . Each CE device emulates a bridge

A . To enable OSPF authentication in a network， OSPF area 0 authentications must be enabled first B . The payload of OSPF version 3 packets contains no authentication information C . OSPF version 3 supports Advanced Encryption Standard D . OSPF version 3 uses router ID as a key to encrypt OSPF hello packets E . OSPF MD5 authentication uses TCP， and Plan Test authentication uses UDP

A . It is generated by an ASBR and indicates the reachability to an ABR located in another area. B . It is generated by ABR and indicates the reachability to an ASBR located in another AS. C . It is generated by ABR and indicates reachability to itself. D . It is generated by ABR and indicates the reachability to an ASBR located in another area. E . It is generated by ASBR and indicates the reachability to an ABR.

A . The ABR must have multiple interfaces connected to the backbone areA B . An ABR is a router with two interfaces, each connected to a different nonbackbone areA C . The only requirement to be considered an ABR is at least one interface connected to the backbone areA D . An ABR must have at least one interface in the backbone area plus at least one other interface in a nonbackbone areA

A . It must be issued before the network command to enable the OSPF pr ocess for IPv6. B . It must be issued after the network command to enable the OSPF process for IPv6. C . It must be issued in router global configuration mode to enable the OSPF process for IPv6. D . It must be issued in interface configuration mode to ena ble the OSPF process for IPv6.

A . Routes learned using any IP routing protocol can only be redistributed into non IP routing protocols. B . OSPF can import routes learned using EIGRP, RIP, and IS - IS. C . OSPF routes cannot be exported into EIGRP, RIP, an d IS - IS. D . At the interdomain level, OSPF cannot import routes learned using BGP. E . OSPF routes can be exported into BGP.

A . Areas introduce a boundary on the link - state updates. B . Areas are logical definitions specific to any given router. C . All routers within an area have the exact link - state database. D . The calculation of the Dijkstra algorithm on a router is limited to changes within an area. E . The area designated router will always have a priority of 0.

A . Based on the default timers, OSPF d etects a failure faster than IS - IS does. B . OSPF default timers permit more tuning than IS - IS does. C . IS - IS is more efficient than OSPF in the use of CPU resources. D . OSPF is more scalable than IS - IS because of its ability to identify normal, stub, an d NSSA areas. E . IS - IS and OSPF are both Open Standard, link - state routing protocols which support VLSM.

A . The primary color of the suit's exterior may be red，orange or yellow B . The suit must，without assistance，turn an unconscious person's mouth clear of the water within 5 seconds C . The suit is flameproof and provides protection to a wearer swimming in burning oil D . The suit may be stored in a machinery space where the ambient temperature is 160°F

A .  NPIV provides a means to assign multiple Fibre Channel IDs to a single N-port. B .  NPIV can be enabled on a per-VSAN basis. C .  NPIV requires a "write erase" and then reload the switch in order to come up into NPIV mode.  D .  NPIV is a Cisco proprietary feature and as such works only between two Cisco switches. E .  NPIV must not be enabled on a switch that is also running N-port virtualization.

A . The MDT group address should be the same for both address families in the same VRF B . The MDT group address should be the same for both address families in the different VRFs C . Configuration of the MDT source on a pre-VRF basis is supported only on IPv6 D . The MDT group address should be different for both address families in the same VRF

A . It requires OSPF version 3. B . automatically detects neighbors over NHMA interfaces C . It supports encryption using D . It uses LSA type 9 E . It uses LSA type 8

A . They must be fully meshed B . They can be in a different AS C . C . They do not need to be directly connected D . They must be directly connected

A . RIPng allows for routes with up to 30 hops. B . RIPng is enabled on each interface separately. C . RIPng uses broadcasts to exchange routes. D . There can be only one RIPng process per router.

A . Addresses are not hierarchical and are assigned at random. B . Only one IPv6 address can exist on a given interface. C . There are 2.7 billion addresses available. D . Broadcasts have been eliminated and replaced with multicasts.

A . If it is triggered by Type 4， all Type 4 LSAs that announce a certain ASBR and all Type 5 and 7 LSAs are processed B . If it is triggered by Types 5 and 7， all Type 5 and 7 LSAs that contribute to a certain destination are processed. C . If it is triggered by Type 2， all Type 2 LSAs that contribute to a certain destination are processed. D . If it is triggered by the change of Type 3， 4， 5， and 7 LSAs. E . If it is triggered by the change of Type 2， 3， 5， and 7 LSA

A . Interfaces have a default metric of 1. B . Level 1 is intra - area and level 2 is interarea. C . Level 1 routing is between an end system (ES) and IS while Level 2 routing is between an IS and IS. D . Hosts send ISHs while routers send ESHs. E . IS - IS is an open standard. F . Metrics depend on interface speed.

A . Influencing users to forward a call to a toll number （for example， a long distance or international number） B . Influencing users to provide personal information over a web page C . Using an inside facilitator to intentionally forward a call to a toll number （for example， a long distance orinternational number） D . Influencing users to provide personal information over the phone

A . Only redistributed RIP routes will appear in Area 1. They will be advertised via t ype 7 LSAs B . No redistributed routes can appear in Area 1, only summary routes C . Redistributed RIP and IGRP routes will appear in Area 1. They will be advertised via type 5 LSAs D . Only redistributed IGRP routes will appear in Area 1. They will be advertised via type 7 LSA

A . For the two vlans to communicate，a network statement for the trunk interface needs to be added to the OSPF configuration. B . For the two vlans to communicate， a network statement for each subinterface needs to be  added  to the OSPF configuration. C . Direct inter-vlan communication does not require OSPF D . OSPF cannot be used if router-on-a-stick is configured on the router

A . The IPS is in the traffic path. B . Only one active interface is required. C . Full benefit of an IPS will not be realized unless deployed in conjunction with an IDS. D . When malicious traffic is detected，the IPS will only send an alert to a management station.

A . Foam conducts electricity B . To be most effective，foam should be directed at the base of the fire C . Foam is most effective on burning liquids which are flowing D . Foam can ONLY be used to extinguish class A fire

A . When the voice VLAN feature is enabled， all untagged voice and data traffic is sent through the voice VLAN. B . The voice VLAN feature is enabled by default. C . The IP phone overrides the priority of all incoming data traffic （tagged and untagged） and sets the CoS value to 0. D . The default CoS value is 1 for incoming voice and data traffic.