cisco ccna wireless 200-355

cisco ccna wireless 200-355.Question, Answer, Authority, and Additional Information. Either UDP or TCP can be used as the transport protocol for DNS, and DNS servers typically listen to both UDP and TCP on port 53.ports. RFC1035 recommends using UDP port 53 for DNS standard queries and TCP port 53 for DNS zone transfers.1.7 IPv6 Basics The previous section described how two or more hosts can "interoperate" with the help of some routable protocol (e.g., the IP protocol), and focused on IPv4 as a routable protocol. This section introduces a newer version of the IP protocol: IPv6.1.6 Domain Name System (DNS) 79The IPv4 address of "www.epubit.com" is also not known, but will revert to the IP address of the authoritative DNS server for the .com domain (.com name servers).With the booming growth of the TCP/IP model-based Internet and communications networks, the IPv4 address space is rapidly depleting. The use of private addresses, supplemented by NAT or CIDR, can alleviate the IPv4 address space depletion problem to some extent, but a long-term solution is needed. IPv6 was designed with this in mind, and its primary use is to provide a larger IP address space to meet the growth in the number of devices communicating using the TCP/IP model.Most of the concepts introduced in Section 1.4, such as routing packets and routing protocols, apply to IPv6 as well. of course, given the differences in packet structure between IPv6 and IPv4 (e.g., different address lengths), some of the concepts of IPv6 have changed compared to IPv4.This book does not attempt to cover the IPv6 protocol in detail; however, security professionals and candidates taking the CCNACyber Ops SECFND exam must have a basic knowledge of IPv6 addresses, how IPv6 works, and how IPv6 differs from and is the same as IPv4.The key differences and commonalities between IPv6 and IPv4 are shown in Table 1-20.Table 1-20 Comparison of IPv4 and IPv6