CCNA - IPv6

CCNA - IPv6重點：
* 長度128位元，由16進位的8段4個字組成
* 多個0可以縮寫
  縮寫1. 0102→102
  縮寫2. 0000→0
  縮寫3. n個:0000:→::（一個位址只能使用一次）
* IPv6 支援三種位址類型
  單播位址 Unicast Address
  多播位址 Multicast Address FF00::/8
  任播位址 Anycast Address
  沒有廣播 Broadcast
* 單點傳播 IPv6 位址分成五種類型：
   * 全域單點傳播位址 Global Unicast Address 2000::/3
      相當於公用 IPv4 位址。它們可在 IPv6 網際網路上全域路由和連線。
      不同於目前以 IPv4 為基礎的網際網路，它是平面及階層路由的混合。
   * 連結-本機位址 Link-Local Address 開頭為 FE80::/64 FE80::/10
      相當於在執行 Windows 的電腦上自動設定的自動私人 IP 位址 (APIPA) IPv4 位址。
      APIPA 位址使用 169.254.0.0/16 首碼。
   * 網路本機位址 Site-Local Address 開頭為 FEC0::/10
      相當於 IPv4 私人位址空間 (10.0.0.0/8、172.16.0.0/12 以及 192.168.0.0/16)。
   * 特定位址 Special Address
      未指定位址 Unspecified Address 0.0.0.0.0.0.0.0 或::/128 （相當於 IPv4 的0.0.0.0）
      單播環回地址 Loopback Address 0.0.0.0.0.0.0.1 或::1/128（相當於 IPv4 的 127.0.0.1）
   * 相容性位址 Compatibility Address
* 唯一區域位址 ULA Unique Local Address FC00::/7 （只可在一群網站中遶送）

http://www.iana.org/assignments/ipv6-address-space/
http://technet.microsoft.com/en-us/library/cc755011(WS.10).aspx
http://technet.microsoft.com/zh-tw/library/cc755011(WS.10).aspx

What is known as "one-to-nearest" addressing in IPv6?
A. global unicast
B. anycast
C. multicast
D. unspecified address

Answer: B

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

Answer: BC

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

Answer: AD

Identify the four valid IPv6 addresses. (Choose four.)
A. ::
B. ::192:168:0:1
C. 2000::
D. 2001:3452:4952:2837::
E. 2002:c0a8:101::42
F. 2003:dead:beef:4dad:23:46:bb:101

Answer: ABEF

Which option is a valid IPv6 address?
A. 2001:0000:130F::099a::12a
B. 2002:7654:A1AD:61:81AF:CCC1
C. FEC0:ABCD:WXYZ:0067::2A4
D. 2004:1:25A4:886F::1

Answer: D

How many bits are contained in each field of an IPv6 address?
A. 24
B. 4
C. 8
D. 16

Answer: D

Which term describes the process of encapsulating IPv6 packets inside IPv4 packets?
A. tunneling
B. hashing
C. routing
D. NAT

Answer: A

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.

Answer: D

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

Answer: D

What are three IPv6 transition mechanisms? (Choose three.)
A. 6to4 tunneling
B. VPN tunneling
C. GRE tunneling
D. ISATAP tunneling
E. PPP tunneling
F. Teredo tunneling

Answer: ADF