Which two data link layers are supported by cisco ios software for IPv6?（）

A .  The access layer is the first oversubscription point in a data center design. B .  When using a Layer 2 loop-free design， VLANs are extended into the aggregation layer. C .  When using a Layer 2 looped design， VLANs are not extended into the aggregation layer. D .  When using a Layer 3 design， stateful services requiring Layer 2 connectivity are provisionedfrom the aggregation layer. E .  The data center access layer provides the physical-level connections to the server resourcesand only operates at Layer 3.

A . application layer B . session layer C . transport layer D . network layer E . datalink layer F . physical layer

A .  Layer 3 routing between the Access and Aggregation layers facilities the ability to span VLANsacross multiple access switches， which is a requirement for many server virtualization andclustering technologies. B .  “East-west” server-to-server traffic can travel between aggregation modules by way of the core，but backup and replication traffic typically remains within an aggregation module. C .  Load balancing， firewall service， and other network service are commonly integrated by the useof service modules that are inserted in the aggregation switched. D .  Virtualization tools allow a cost effective approach for redundancy in the network design byusing two or four VDCs from the same physical switch.

A . committing a transaction B . rolling back a transaction C . recovering from failed transactions D . recording a transaction to redo log files E . rolling forward during instance recovery

A . application layer B . session layer C . transport layer D . network layer E . datalink layer F . physical layer

A . T1 B . Frame Relay C . DSL D . PPP E . ISDN F . IPX

A .  VLAN trunking B .  An external router C .  An internal route processor D .  VLAN capable bridge E .  EtherChannel

A .  Member data have no access modifiers. B .  Member data can be modified directly. C .  The access modifier for methods is protected. D .  The access modifier to member data is private. E .  Methods provide for access and modification of data.

A .  An interface can belong to multiple Flex Links. B .  Flex Links operate only over single pairs of links. C .  Flex Link pairs must be of the same interface type D .  Flex Links automatically disable STP so no BPDUs are propagated E .  Failover from active to standby on Flex Links takes less than a second

A . VTP B . 802.1q C . IGP D . ISL E . 802.3u

A . show interfaces interface B . show vlan brief C . show interfaces interface switchport D . show interface interface trunk E . show interfaces vla

A .  Member data have no access modifiers. B .  Member data can be modified directly. C .  The access modifier for methods is protected. D .  The access modifier to member data is private. E .  Methods provide for access and modification of data.

A . Application B . Presentation C . Session D . Transport E . Network F . Data-Link

A . ISDN B . Frame Relay C . ATM D . FDDI

A、ECDIS warnings and messages B、Hydrographic Office data C、Notice to Mariners information D、All of the above

A . show interfaces interface B . show vlan bri C . show interfaces interface switchport D . show interface interface trunk E . show interfaces vla

A .  Loop guard can be used with root guard simultaneously on the same port on the same VLAN while UDLD cannot B .  UDLD protects against STP failures caused by cabling problems that create one-way links. C .  Loop guard detects and protects against duplicate packets being received and transmitted on different ports D .  UDLD protects against unidirectional cabling problems on copper and fiber media. E .  Loop guard protects against STP failures caused by problems that result in the loss of BPDUs from a designated switch port.

A . session B . transport C . network D . data link E . physical

A . It divides the network communication process into smaller and simpler components, thus aiding component development, design, and troubleshooting. B . It enables equipment from different vendors to use the same electronic components, thus saving research and development funds. C . It supports theevolution of multiple competing standards, and thus provides business opportunities for equipment manufacturers. D . It encourages industry standardization by defining what functions occur at each layer of the model. E . It provides a means by which changes in functionality in one layer require changes in other layers.

A . Loop guard can be used with root guard simultaneously on the same port on the same VLAN while UDLD cannot. B . UDLD protects against STP failures caused by cabling problems that create one-way links. C . Loop guard detects and protects against duplicate packets being received and transmitted on different ports. D . UDLD protects against unidirectional cabling problems on copper and fiber media. E . Loop guard protects against STP failures caused by problems that result in the loss of BPDUs from a designated switch port.

A . An interface can only belong to single Flex Links. B . An interface can belong to multiple Flex Links. C . Flex Links operate only over single pairs of links. D . Flex Links automatically disable STP so no BPDUs are propagated.

A . session B . transport C . network D . data link E . physical

A . The virtual routing and forwarding table is separate from the global routing table that exists on PE routers. Routes are injected into the VRF from the CE-PE routing protocols for that VRF and any MP-BGP announcements that match the defined VRF RTs B . Multiprotocol Border Gateway Protocol is run between PE and CE routers to exchange customer prefixes in a VPNv4 format C . A customer edge router peers at Layer 3 to the provider edge. The PE-CE interface runs either a dynamic routing protocol （eBGP， RIPv2， EIGRP， OSPF） or a static routing protocol （Static， Connected） D . VPNv4 address is the combination of the RT and customer IPv4 prefix. These VPNv4 prefixes are passed in MP-BGP

是 否