200-301 reddit

200-301 reddit.subnet, the IOS sometimes recognizes it, but sometimes it does not, as shown below.FOS blocks overlap on a single router: when the address referred to by the ip address command overlaps with another ip address command on the same router, then IOS detects the overlap.. Allow overlap on different routers: when the ipaddress command overlaps with an ipaddress command on another router. then IOS does not detect the overlap. The router shown in Example 5-6 prevents the configuration of overlapping VLSM subnets. The example shows router R3 configuring FaO/O with IP address 172.16.5.1/24 and attempting to configure FaO/1 with 172.16.5.193/26. the address ranges for each subnet are shown below. Subnet 172.16.5.0/24 : 172.16.5.1 ~ 172.16.5.254Subnet 172.16.5.192/26 : 172.16.5.193.172.16.5.254 Example 5-6 Single Router Rejects Overlapping SubnetsR3#configure terminal R3(config)#interface FaO/O R3(config-if)# ip address 172.16.5.1255.255.255.0 R3(config-if)# interface FaO/1 R3(config- if)# ip address 172.16.5.193 255.255.255.192 % 172.16.5.192overlaps with FastEthernetO/O R3(config-if)#The IOS understands that the address range referred to by the overlap subnet is a violation. In this use case, because the two subnets are about to be connected to each other, this unique router knows that the two subnets cannot coexist because it violates the rules of subnetting, so IOS rejects the second command.As a side note about how IOS handles these errors, I0S only performs subnet overlap checks on interfaces that are not in the shutdown state. When configuring an interface that is in the shutdown state, I0S actually accepts this ip address command that causes the overlap. Later, when the no shutdown command is run, IOS checks for subnet overlap and issues the same error message as in Example 5-6. IOS puts the interface in the shutdown state until the overlap is resolved.IOS cannot detect overlapping subnet configurations on different routers, as shown in Example 5-7. The example gives the two overlapping subnet configurations on R2 and R3 in Figure 5-15.Example 5-7 Two Routers Accepting Overlapping SubnetsR2#configure terminal R2(config)#interface G0/0 R2(config-if)# ip address 172.16.4.1255.255.254.0 !Next, on router R3 R3#configure terminal R3( config)# interface G0/0 R3(config-if)# ip address 172.16.5.1255.255.255.0