what is the broadcast address of a Cisco router?
Wednesday, December 23rd, 2009 at
1:50 am
i was reding a book about Cisco routing, and it mentioned broadcast addresses. i administer the network at my house, and am curious about it.
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Broadcasting is an interesting little beast. It is - these days - typically the last (typically non-usable) address within a subnet after applying a mask to it. As stated below, if you had a 10.10.10.0/24 subnet/mask, then the following would be true:
10.10.10.0 = network (non-usable)
10.10.10.255 = network broadcast (usually non-usable)
10.10.10.1 - 254 = usable addresses within the subnet
There is another type of broadcast, often called "all-nets" broadcast and back in the day, it could cause some securtiy issues, and that is the 255.255.255.255 address (a broadcast to all networks). Hope some of this helps.
the broadcast address is the last ip on the network
so for ex. the network of 10.10.1.0/24 would be 10.10.1.255 or if your network is 10.10.1.0/25 the broadcast would be 10.10.1.127 when a packet is sent out on a broadcast if nothing is there to split it up(i.e. a router) then the packet is received by all network devices