[多项选择]You wish to configure IPv6 support on a router which does not have any current IPv4 configuration.Which three steps are used to configure IPv6 with an accompanying IGP in JUNOS software? （）
A. set protocols isis inet6
B. set routing-options router-id router-id
C. set protocols ospf3 area 0 interface all
D. set interface fe-0/0/1 unit 0 family inet6
E. set routing-options ipv6-router-id router-id

[单项选择]A router receives an IPv6 packet which is 2000 bytes in length. The MTU of the outgoing interface is 1500 bytes. Which action will the router take?（）
A. Forward the packet.
B. Fragment the packet.
C. Drop the packet silently.
D. Drop the packet and send an ICMPv6 message.

[单项选择]Running both IPv4 and IPv6 on a router simultaneously is known as what?（）
A. 4to6 routing
B. 6to4 routing
C. binary routing
D. dual-stack routing
E. NextGen routing

[单项选择]What is IPv6 router solicitation?（）
A. a request made by a node to join a specified multicast group
B. a request made by a node for its IP address
C. a request made by a node for the IP address of the DHCP server
D. a request made by a node for the IP address of the local router

[单项选择]While logged into a router, you wish to see the RIP routing updates in real time as they are sent and received. Which command would you issue to see these updates?（）
A. Show ip protocols
B. Show ip route rip
C. Debug ip rip
D. Debug ip updates
E. Debug ip transactions

[多项选择] When an IPv6 enabled host boots, it sends a router solicitation (RS) message. An IPv6 router responds with a router advertisement (RA). Which two items are c ontained in the RA?（）
A. any route advertisements it has received
B. prefixes for the link
C. keepalive timers
D. IPv6 address for the host
E. request for the local host IP address
F. lifetime of the prefix

[单项选择]Router R1 has been conf igured with an ipv6 route 2000::/64 S0/0/0 64 command.Which of the following does the 64 at the end of the command represent?（）
A. Metric
B. Administrative distance
C. Timeout (seconds)
D. Prefix length
E. Interface ID

[多项选择]You configure your database Instance to support shared server connections.Which two memory areas that are part of PGA are stored in SGA instead, for shared server connection?（）
A. User session data
B. Stack space
C. Private SQL area
D. Location of the runtime area for DML and DDL Statements
E. Location of a part of the runtime area for SELECT statements

[单项选择]You wish to upgrade the IOS of a router without removing the image currently installed.What command will display the amount of memory that is being used by the current IOS image and whether there is enough room available to hold both the current and new images?（）
A. Router# show version
B. Router# show flash
C. Router# show memory
D. Router# show buffers
E. Router# show running-config
F. All of the above

[名词解释]IPv6

[单项选择]Which IPv6 address correctly compresses the IPv6 unicast address 2001:0:0:0:0DB8:0:0:417A?（）
A. 2001:0DB8:417A
B. 2001::0DB8::417A
C. 2001:::0DB8::417A
D. 2001:0D B8:0:0:417A
E. 2001::DB8:0:0:417A
F. 2001:::0DB8:0:0:417A

[单项选择]A router receives an IPv6 packet which is 2000 bytes in length. The MTU of the outgoing interface is 1500 bytes. What action will the router take？（）
A. forwards the packet
B. fragments the packet
C. drops the packet silently
D. drops the packet and sends an ICMP message

[单项选择]How does an IPv6 router deal with a packet that is larger than the outgoing interface MTU？（）
A. It will fragment the packet at Layer 2.
B. It will fragment the packet at Layer 3.
C. It will drop the packet and send an ICMPv6 message "packet too big" back to the source.
D. It will drop the packet.

[多项选择] In IPv6 network, an IPv6 overlay tunnel is required to communicate with isolated IPv6 networks across the existing IPv4 infrastructurE. There are currently fiv e IPv6 overlay tunnel types. Which three IPv6 overlay tunnel statements are true？（）
A. Overlay tunnels can only be configured between border routers capable of supporting IPv4 and IPv6.
B. An manual overlay tunnel supports point - to - multipo int tunnels capable of carrying IPv6 and Connectionless Network Service (CLNS) packets.
C. Overlay tunneling encapsulates IPv6 packets in IPv4 packets for delivery across an IPv4 infrastructure.
D. Overlay tunnels can be configured between border route rs or between a border router and a host capable of supporting IPv4 and IPv6.
E. Cisco IOS supports manual, generic routing encapsulation (GRE), IPv4 - compatible, 6to4, and Intra - Site Automatic Tunnel Addressing Protocol (ISATAP) overlay tunneling mechan isms.
F. Cisco IOS supports manual, generic routing encapsulation (GRE), IPv6 - compatible, 4to6, and Multiprotocol Label Switching (MPLS) overlay tunneling mechanisms.

[多项选择]网络管理员已被要求说明理由从IPv4向IPv6。什么是IPv6的采用在IPv4两种有效的原因是什么？（）
A. telnet访问不需要密码
B. NAT
C. 没有广播
D. 目的地址的IPv6报文头改变
E. 源地址的IPv6报文头改变
F. 自动配置

[单项选择]We wish to assure you that we appreciate an opportunity afforded us for service.
A. 请相信我们是很感激您的，我们希望有机会为您服务。
B. 请坚信，我们将非常感谢您能有机会为我们提供服务。
C. 我们希望向您保证我们很欣赏您为我们提供的一切服务。
D. 我们的愿望是能够有机会为您服务并提供一切帮助。

[简答题]为什么要用IPV6协议？IPV6的报文头结构式什么？

[单项选择]在IPv6中，地址被扩充为128位，并且为IPv4保留了一部分地址空间。按照IPv6的地址表示方法，以下地址中属于IPv4地址的是（）。
A. 0000:0000:0000:0000:0000:FFFF:1234:1180
B. 0000:0000:0000:1111:111t:FFFF:1234:1180
C. 0000:0000:FFFF:FFFF:FFFF:FFFF:1234:1180
D. FFFF:FFFF:FFFF:FFFF:FFFF:FFFF:1234:1180