cisco ccna udemy

cisco ccna udemy.From the routing table for R1 shown in Table 1.13, the destination networks 10.0.1.0/24, 10.0.2.0/24, and 10.040/24 are directly connected to R1. The fourth route (destination network 10.0.3.0/24) matches the destination IP address of the packet, and its next hop IP address is R2 (10.0.2.2) o The last route (destination network 0.0.0.0/0) is called the default route, and for all packets whose destination IP addresses do not match the first four destination networks, R1 sends them out the F0/3 interface to 10.0 .4.2 (R3F0/1 interface). This means that R1 has a default route to R3.When the router queries the routing table, it selects the interface associated with the optimal route for outgoing packets. The optimal route is the one that matches the most bits of the destination network (from left to right) with the bits of the destination IP address of the packet among all routes in the routing table. As an example, the routing table of a router contains the following two routes, as shown in Table 1.14.Table 1-14 Example of a Router Selecting the Optimal Route to Forward a Packet 63 Chapter 1 Network Protocols and Network Device BasicsYes, :: can only appear once in an IPv6 address. Take the IPv6 address FE00:0000:0000:0001:0000:0000:0000:0000:0056 as an example. According to the first principle above, the IPv6 address can be written as FEOO:O:0:1:0:0:0:0:56. The second principle above applies to groups 2, 3 or 5.7 hexadecimal numbers of this IPv6 address, but not10.0.3.0/24 i 10.0.2.2 come F0/210.0.0.0/1610.0.4.264 Chapter 1 Network Protocols and Network Device BasicsYes, :: can only appear once in an IPv6 address. Take the IPv6 address FE00:0000:0000:0001:0000:0000:0000:0000:0056 as an example. According to the first principle above, the IPv6 address can be written as FEOO:O:0:1:0:0:0:0:56. The second principle above applies to groups 2, 3, or 5.7 hexadecimal numbers of this IPv6 address, but not both. Choosing the latter application makes this IPv6 address look more concise, as shown below.Return to the example in Figure 1-56. R1 forwards a packet with a destination IP address of 10.0.3.3 to the next-hop router, R2. Before forwarding, R1 changes the contents of the header of that IP packet (for example, it subtracts 1 from the TTL field value and recalculates the checksum). Note that R1 does not change the source and destination IP address field values in the header of the IP packet. When an IP packet is received from interface F0/1, R2 also queries the local routing table to determine how to forward the packet. Table 1-15 shows the routing table for R2.