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If router1 routing table does not have any route to 192.168.1.0/24, and PC3 tries to access a resource outside its own network, then the outgoing routing will work until the reply is fed back to router1. Since the route is unknown to router1, it will go to router1's default gateway, and never reach router3.
In Internet networking, a private network is a computer network that uses a private address space of IP addresses.These addresses are commonly used for local area networks (LANs) in residential, office, and enterprise environments.
A router typically does not look into the packet payload, [52] but only at the layer-3 addresses to make a forwarding decision, plus optionally other information in the header for hints on, for example, quality of service (QoS). For pure IP forwarding, a router is designed to minimize the state information associated with individual packets. [53]
First, Computer 1 uses a cached ARP table to look up 192.168.0.55 for any existing records of Computer 2's MAC address (00:EB:24:B2:05:AC). If the MAC address is found, it sends an Ethernet frame containing the IP packet onto the link with the destination address 00:EB:24:B2:05:AC.
However, this does not mean that every address ending in 0 or 255 cannot be used as a host address. For example, in the / 16 subnet 192.168.0.0 / 255.255.0.0 , which is equivalent to the address range 192.168.0.0 – 192.168.255.255 , the broadcast address is 192.168.255.255 .
SIADDR (Server IP address: 0xC0A80101 or 192.168.1.1) 52 416 GIADDR (Gateway IP address: 0x00000000) 56 448 CHADDR (Client Hardware address: 0x00053C04 0x8D590000 0x00000000 0x00000000) 60 480 64 512 68 544 72 576 192 octets of 0s, or overflow space for additional options; BOOTP legacy. ⋮ ⋮ 260 2080 264 2112 Magic Cookie (0x63825363)
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For example, the destination address used for directed broadcast to devices on the network 192.0.2.0 / 24 is 192.0.2.255. [24] IPv6 does not implement broadcast addressing and replaces it with multicast to the specially defined all-nodes multicast address.