"深入学习IPv6网络协议：《CCNA学习指南第六版》中相关专业译文与原文详解"

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The document "计算机网络专业译文关于IPv6.doc" provides a detailed overview of Internet Protocol version 6 (IPv6) in the field of computer networking. The translation covers various aspects of IPv6, including its benefits, features, and comparisons with the older IPv4 protocol. Additionally, the professional translation of the book "Cisco Certified Network Associate Study Guide.Sixth Edition" by Todd Lammle delves into the specifics of IPv6 from pages 740-747. The original English text emphasizes the importance of understanding IPv6 in today's networking landscape, especially for individuals already familiar with IPv4. Overall, both the translated document and the book excerpt offer valuable insights into the complexities of IPv6, serving as essential resources for individuals seeking to enhance their knowledge and skills in computer networking. The extensive coverage of IPv6 in these materials equips readers with the necessary information to navigate the evolving technological landscape effectively.

that additional room permits more levels of hierarchy inside the address space and a more flexible

address architecture. It also makes routing much more efficient and scalable because the addresses

can be aggregated a lot more effectively. And IPv6 also allows multiple addresses for hosts and

networks. This is especially important for enterprises jonesing for availability. Plus, the new

version of IP now includes an expanded use of multicast communication (one device sending to

many hosts or to a select group), which will also join in to boost efficiency on networks because

communications will be more specific.

IPv4 uses broadcasts very prolifically, causing a bunch of problems, the worst of which is of

course the dreaded broadcast storm-an uncontrolled deluge of forwarded broadcast traffic that can

bring an entire network to its knees and devour every last bit of bandwidth. Another nasty thing

about broadcast traffic is that it interrupts each and every device on the network. When a broadcast

is sent out, every machine has to stop what it's doing and respond to the traffic whether the

broadcast is meant for it or not.

But smile everyone: There is no such thing as a broadcast in IPv6 because it uses multicast traffic

instead. And there are two other types of communication as well: unicast, which is the same as it is

in IPv4, and a new type called anycast. Anycast communication allows the same address to be

placed on more than one device so that when traffic is sent to one device addressed in this way, it

is routed to the nearest host that shares the same address. This is just the beginning-we'll get more

into the various types of communication in the section called "Address Types”

IPv6 Addressing and Expressions

Just as understanding how IP addresses are structured and used is critical with IPv4 addressing, it's

also vital when it comes to IPv6. You've already read about the fact that at 128 bits, an IPv6

address is much larger than an IPv4 address. Because of this, as well as the new ways the

addresses manage. But can be used, you've probably guessed that IPv6 will be more complicated

to no worries! As I said, I'll break down the basics and show you what the address looks like, how

you can write it, and what many of its common uses are. It's going to be a little weird at first, but

before you know it, you'll have it nailed!

So let's take a look at Figure 13.1, which has a sample IPv6 address broken down into sections.

FIGURE 13 .1 IPv6 address example

So as you can now see, the address is truly much larger-but what else is different? Well, first,

notice that it has eight groups of numbers instead of four and also that those groups are separated

by colons instead of periods. And hey wait a second…there are letters in that address! Yep, the

address is expressed in hexadecimal just like a MAC address is, so you could say this address has

eight 16-bit hexadecimal colon-delimited blocks. That's already quite a mouthful, and you

probably haven't even tried to say the address out loud yet!

One other thing I want to point out is for when you set up your test network to play with IPv6,

because I know you're going to want to do that. When you use a web browser to make an HTTP

connection to an IPv6 device, you have to type the address into the browser with brackets around

the literal address. Why? Well, a colon is already being used by the browser for specifying a port

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