CCNA系列认证

单选题Which statement about IPv6 is true?（）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 mult

题目
单选题
Which statement about IPv6 is true?（）
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.

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相似问题和答案

第1题：

Refer to the exhibit. Based on the output from the show command on RT1which statement is true? ()

A. OSPFv3 uses global IPv6 addresses to establish neighbor adjacencies.

B. RT1 has a subnet mask of 64 bits .

C. RT1 has FastEthernet0/0 set as a DR for network type broadcast.

D. OSPFv3 uses Link - local addresses to establish neighbor adjacencies.

E. RT1does not have a global IPv6 address set on FastEthernet0/0.

F. OSPFv3 uses IPv4 addresses to establish nei ghbor adjacencies.


参考答案：D

第2题：

Which statement is true about IPv6?()

A. Only one IPv6 address can be assigned to each interface.

B. IPv6 hosts use anycast addresses to assign IP addresses to interfaces.

C. Each host can a utoconfigure its address without the aid of a DHCP server.

D. Only one IPv6 address is assigned per node.


参考答案：C

第3题：

Which statement is correct regarding IPv6 addresses?()

A. An IPv6 address consists of 128 bits separated into eight 16-bit hexadecimal sections.

B. An IPv6 address consists of 64 bits separated into four 16-bit hexadecimal sections.

C. An IPv6 address consists of 128 bits separated into sixteen 8-bit hexadecimal sections.

D. An IPv6 address consists of 64 bits separated into eight 8-bit hexadecimal sections.


参考答案：A

第4题：

Which two statements describe characteristics of IPv6 unicast addressing?()

A. Global addresses start with 2000::/3.

B. Link-local addresses start with FE00:/12.

C. Link-local addresses start with FF00::/10.

D. There is only one loopback address and it is ::1.

E. If a global address is assigned to an interface, then that is the only allowable address for the interface.


参考答案：A, D

第5题：

Which statement describes the process of dynamically assigning IP addresses by the DHCP server?()

A. Addresses are allocated after a negotiation between the server and the host to determine the length of the agreement.

B. Addresses are permanently assigned so that the hosts uses the same address at all times.

C. Addresses are assigned for a fixed period of time, at the end of the period, a new request for an address must be made.

D. Addresses are leased to hosts, which periodically contact the DHCP server to renew the lease.


参考答案：D

第6题：

In IPv6, the interfaces running OSPF can be configured with multiple ad dress prefixes.Which statement is true about the IPv6 addresses that can be included into the OSPF process?" ()

A. Specific addresses can be selected using a prefix list.

B. Specific addresses can be selected using a route map.

C. Specific addresses cann ot be selected for importation into the OSPF process.

D. Specific addresses can be selected using an ACL.


参考答案：C

第7题：

Which statement about IPv6 is true?()

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.


参考答案：D

第8题：

Which two statements are true about using IPv4 and IPv6 simultaneously on a network segment? ()

A. IPv6 allows a host to create its own IPv6 address that will allow it to communicate to other devices on a network configured via DHCP. IPv4 does not provide a similar capability for hosts.

B. IPv6 provides for more host IP addresses but IPv4 provides for more network addresses.

C. Hosts can be configured to receive both IPv4 and IPv6 addresses via DHCP.

D. Host configuration options for IPv4 can be either statically assigned or assigned via DHCP.Host configuration options for IPv6 can be statically assigned only.

E. IPv4 and IPv6 addresses c an be simultaneously assigned to a host but not to a router interface.


参考答案：A, C

第9题：

Which two of these statements are true of IPv6 address representation?()

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.


参考答案：B, C

第10题：

The number of home users and small businesses that want to use the Internet is ever increasing. The shortage of addresses is becoming a serious problem. A quick solution to this problem is called network address translation(NAT).NAT enables a user to have a large set of addresses（ ）and one address, or a smallset of addresses,externally. The traffic inside can use the large set; the traffic（ ）, the small set. To separate the addresses used inside the home or business and the ones used for the Internet, the Internet authorities have reserved three sets of addresses as （ ） addresses. Any organization can use an address out of this set withoutpermission from the Internet authorities. Everyone knows that these reserved addresses are for private networks.They are （ ） inside the organization, but they are not unique globally. No router will （请作答此空） a packet that has one of these addresses as the destination address.The site must have only one single connection to the global Internet through a router that runs the NAT software.

A.reject
B.receive
C.deny
D.forward

答案：D
解析：
理解NAT的基本工作原理，这题就简单了。

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