Which three are characteristics of IPv6?()A. An IPv6 address is 128 bits long.B. An IPv6 header contains the header checksum field.C. An IPv6 header is 20 bits long.D. An IPv6 header contains the next header field.E. IPv6 route rs send RA messages.F. An I

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第5题：

What are three benefits of using IPv6?（）

• A、IPv6 supports a greater level of security by integrating features that were optional add-ons in IPv4.
• B、IPv6 reduces administrative overhead using stateless address autoconfiguration for hosts.
• C、IPv6 eliminates the need for private to public NAT using a large address pool.
• D、IPv6 provides backward compatibility with IPv4 using the Next Header field.
• E、IPv6 represents large IP addresses using dotted decimal notation.

正确答案:A,B,C

第6题：

How long is an IPv6 address?（）

• A、32 bits
• B、64 bits
• C、128 bits
• D、256 bits

正确答案:C

第7题：

Which statement is true concerning 6to4 tunneling?（）

• A、The edge routers can use any locally configured  IPv6 address.
• B、Hosts and routers inside a 6to4 site will need a special code.
• C、An edge router must use IPv6 address of 2002::/16 in its prefix.
• D、IPv4 traffic is encapsulated with an IPv6 header.

正确答案:C

第8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.

正确答案:B,C

第9题：

The length of the IPv6 address is （ ）.

• A、64 bytes
• B、128 bytes
• C、64 bits
• D、128 bits

正确答案:D

第10题：

An IPv6 host is configured to request a specific path through the network to reach a destination.Which IPv6 extension header should be used?（）

• A、Routing
• B、Hop-by-Hop
• C、Fragmentation
• D、Destination Options

正确答案:A

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Which statement is correct in reference to IPv6 multicast？（）

• A、IPv6 multicast uses Multicast Listener Discovery.
• B、The first 8 bits of an IPv6 multicast address are always FF （1111 1111）.
• C、IPv6 multicast requires MSDP.
• D、PIM dense mode is not part of IPv6 multicast.

正确答案:A

第17题：

Which two are valid fields in an IPv6 header?（）

• A、Hop Limit
• B、Next Header
• C、Fragment Offset
• D、Header Checksum

正确答案:A,B

第18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.

正确答案:A

第19题：

Which three are characteristics of IPv6?（）

• A、An IPv6 address is 128 bits long.
• B、An IPv6 header contains the header checksum field.
• C、An IPv6 header is 20 bits long.
• D、An IPv6 header contains the next header field.
• E、IPv6 route rs send RA messages.
• F、An IPv6 header contains the protocol field.

正确答案:A,D,E

第20题：

Which of the following is true about the MPLS header and its EXP field size？（）

• A、The MPLS header is 2 bytes，and the EXP field is 3 bits long.
• B、The MPLS header is 1 byte，and the EXP field is 3 bits long.
• C、The MPLS header is 4 bytes，and the EXP field is 3 bits long.
• D、The MPLS header is 3 bytes，and the EXP field is 3 bits long.

正确答案:C

第21题：

Why is IPv6 packet processing more effective than IPv4 packet processing?（）

• A、fixed header size
• B、smaller header size
• C、fewer header fields
• D、variable header size

正确答案:A

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