Which of these are keywords in Java？（）  

A .  class of service B .  bandwidth profiles C .  user-network interface D .  Ethernet LAN circuit attributes E .  Ethernet virtual circuit attribute

A . it is a layer 2 messaging protocol which maintains vlan configurations across network. B . it includes an 8-bit field which specifies the priority of a frame. C . it is used exclusively for tagging vlan frames and dose not address network reconvergence following switched network topology changes. D . it modifies the 802.3 frame header,and thus requires that the FCS be recomputed. E . it is a trunking protocol capable of carring untagged frames.

A . Set extends Collection. B . All methods defined in Set are also defined in Collection. C . List extends Collection. D . All methods defined in List are also defined in Collection. E . Map extends Collection.

A . use ISL encapsulation B . use 802.1q encapsulation C . set ISL to desirable and auto with encapsulation negotiate to support ILS protocol negotiation D . use VTP server mode to support dynamic propagation of VLAN information across the network E . set DTP to desirable and desirable with encapsulation negotiate to support DTP protocol negotiation.

A . PPPoE can provide a host with access to a destination over Ethernet. You can have only one  PPPoE session per PVC B . You must install PPPoE client software on all hosts that connect to the Ethernet segment. This means that the access provider must maintain a CPE C . You cannot use PPPoE with Cisco Service Selection Gateway D . PPPoE implementation is susceptible to broadcast storms and possible denial-of-service attacks E . Per-session accounting is possible， which allows the service provider to charge the subscriber based on session time for various services offered. The service provider can also require a minimum access charge

A . Label B . VPI VCI C . EXP D . TTL E . FCS F . S flag

A . The wires in each pair are wrapped around each other B . An insulating material covers each of the individual copper wires in it C . It comes in eight-pair wire bindles D . EMI and RFI cause only limited degradation to signals running over it E . It comes in seven categories F . IT has an external diameter of approximately 0 28 inche

A .  Layer 3 MPLS VPNs can forward only IP packets B .  Layer 2 MPLS VPNs can forward any network protocol C .  MPL S label paths are automatically formed based on Layer 2 frames D .  Layer 3 MPLS VPNs can forward any network protocol based on Layer 2 frames E .  In Layer 2 MPLS VPNS， the service provider controls the customer Layer 3 policie

A . There are four types of IPv6 addresses: unicast, multicast, anycast, and broadcast. B . A single interface may be assigned multiple IPv6 addresses of any type. C . Every IPv6 interface contains at least one loopback address. D . The first 64 bits represent the dynamically created interface ID. E . Leading zeros in an IPv6 16 bit hexadecimal field are mandatory.

A . reduce the need to personalize communications with customers B . do more with less C . eliminate miscommunication D . influence competitive advantage and business agility through faster decision-making and new business processes and models E . transform your business and organization and be greener F . provide a unified tool for all business processe

A . LDP notification B . L2TPv3 session C . VPN route target communities D . Multiprotocol BGP peering of PE routers E . MPLS forwarding

A . passively listens to network traffic B . is an active device in the traffic path C . has a permissive interface that is used to monitor networks D . traffic arrives on one IDS interface and exits on another E . has a promiscuous interface that is used to monitor the network

A . RSTP cannot operate with PVST+. B . RSTP defines new port roles. C . RSTP defines no new port states. D . RSTP is a proprietary implementation of IEEE 802.1D STP. E . RSTP is compatible with the original IEEE 802.1D STP.

A .  use ISL encapsulation B .  use 802.1q encapsulation C .  set ISL to desirable and auto with encapsulation negotiate to support ILS protocol negotiation D .  use VTP server mode to support dynamic propagation of VLAN information across the network  E .  set DTP to desirable and desirable with encapsulation negotiate to support DTP protocol negotiation.

A . use ISL encapsulation B . use 802.1q encapsulation C . set ISL to desirable and auto with encapsulation negotiate to support ILS protocol negotiation D . use VTP server mode to support dynamic propagation of VLAN information across the network E . set DTP to desirable and desirable with encapsulation negotiate to support DTP protocol negotiatio

A . class of service B . bandwidth profiles C . user-network interface D . Ethernet LAN circuit attributes E . Ethernet virtual circuit attribute

A . DEFAULT STORAGE  B . EXTENT MANAGEMENT  C . AUTOEXTEND  D . DATAFILE

A . passively listens to network traffic B . is an active device in the traffic path C . has a permissive interface that is used to monitor networks D . traffic arrives on one IPS interface and exits on another

A .  multicast routing uses RPF B .  multicast routing is connectionless. C .  In multicast routing， the source of a packet is known. D .  When network topologies change， multicast distribution trees are not rebuilt， but use the originalpath E .  Multicast routing is much like unicast routing， with the only difference being that it has a a groupof receivers rather than just one destinatio

A . RSTP cannot operate with PVST+. B . RSTP defines new port roles. C . RSTP defines no new port states. D . RSTP is a proprietary implementation of IEEE 802.1D STP. E . RSTP is compatible with the original IEEE 802.1D STP.

A .  passively listens to network traffic B .  is an active device in the traffic path C .  has a permissive interface that is used to monitor networks D .  traffic arrives on one IPS interface and exits on another

A . it is a layer 2 messaging protocol which maintains vlan configurations across network. B . it includes an 8-bit field which specifies the priority of a frame. C . it is used exclusively for tagging vlan frames and dose not address network reconvergence following switched network topology changes. D . it modifies the 802.3 frame header，and thus requires that the FCS be recomputed. E . it is a trunking protocol capable of carring untagged frames.

A．as B．dict C．list D．is