Errata

Lists reject as a valid terminating action for a firewall filter and reject is shown in the diagram and listed in the next few pages. Unlike the routing platforms the EX doesn't support a terminating action of reject in a firewall filter.

Note from the Author or Editor:
Remove reject from the list on page 480

sentence reads...You can extend the total number of PoE ports for an EX switch by inserting additional PoE cards if the power supply supports it.

Note from the Author or Editor:
now reads:
"You can extend the total number of PoE ports for an EX switch by inserting additional PoE cards if the power supply supports it"

Change to:

"You cannot extend the number of avaialble PoE ports beyond what the base model supports, but you can chhose not to use some PoE ports, or install a larger power supply, which can influance how much power is made avaialble to a given PoE port."

Book states that 100Mbps divided by 8 is 12.5 bytes per second. This should be 12.5 megabytes per second. Book then has user multiply by 1000 to convert bytes per second to bytes per millisecond. Should read divide by 1000 to convert bytes/sec to bytes/millisec. Interestingly, end result is the same, 12,500 bytes per millisecond.

Note from the Author or Editor:
"The result is 12.5 MB per second. Then divide it by 1,000 to get bytes per millisecond..."

"The widespread use of FD Ethernet, enabled by switches, has eliminated the potential for collisions," and the 1024 host limit.

Note from the Author or Editor:
now reads:
"The wide spread use of FD ethernet, enabled by switches, has eliminated the potential for collisions, which simply made a good thing all the better. "

Change to:

"The wide spread use of FD ethernet, enabled by switches, has eliminated the potential for collisions (and with it the need for a 1,024 node limit), which simply made a good thing all the better. The relaxation of teh node limit is rather moot, however, given that modern Etherent is now switched rather than repeated, and that switches terminate colision domains, the modern reality is that Ethernet has become a point-to-point technology that really only nees to support two nodes per link anyway.

Last sentence within Auto-Negotiation Stance section says:

"This is due to lack of auto-negotiation, and it causes the switch to fall back to the lowest ability of HD..."

Since the switch is fixed at 100 FD, the switch cannot fall back; it must be the network card that is in auto-negotiation state that falls back to HD.

Note from the Author or Editor:
I have reviewed an agree we need to change to:

"This is due to lack of auto-negotiation, and it causes the NIC to fall back it's lowest capability, which ...""