200-301 pdf dumps

200-301 pdf dumps.Although the first problem may be more obvious, note that both static settings and DHCP on the host can cause this problem. If the host is listing the wrong DNS server IP address and the setting is static, then simply change the setting value. If it is2.2 Basics 109An incorrect DNS server address was obtained from DHCP, then you need to check the DHCP configuration. (If you are using the IOSDHCP server feature, you can use the dns-server server-address command in DHCP pool mode to complete the setup.)The second issue raises important questions about troubleshooting real networks in real life. Almost every real user application uses domain names rather than addresses, and most hosts use DNS to resolve domain names. So every connection to a new application involves two sets of packets: those transmitted between the host and the DNS server, and those between the host and the real server, as shown in Figure 5-5.Figure 5-5 DNS name resolution packets transmitted first, then to the real serverFinally, before concluding the topic of domain name resolution, note that we can also configure the router using the IP address of the DNS server so that router commands will attempt to resolve the domain name. For example, in the router's command line interface (CLI) the user can issue the command ping serverl, which uses DNS requests to resolve serverl to a matching IP address. To configure the router to use DNS for domain name resolution, the router needs to execute the ip name-server dns I-addressdns2-address. -global command, and the ip domainlookup global command, which is enabled by default.For troubleshooting purposes, it is helpful to set the router or switch's DNS so that it matches the local host's settings. Note, however, that these settings have no effect on user DNS requests. Tip: In practice, IOS enables the ip domain-lookup command by default, but does not know any DNS IP addresses. Most network engineers either add a configuration that points to a DNS server or use the ip domain-lookup command to disable DNS.Wrong Default Router IP Address Setting ValueObviously, problems will occur if the host's default router has an incorrect IP address. When sending packets to other subnets, the host needs to rely on the default router, and if the host lists the wrong default router, then it may not be able to send packets to a different subnet.Figure 5-6 gives an example of this. In this example, both hosts A and B have 10.1.3.4 configured as the default router because of incorrect documentation. Router R3 uses the IP address l0.l.3.3 (assuming, for the sake of discussion, that no other hosts are currently on the subnet.