Questions before taking CCNA

Hi again.

I have taken a network course. I even learnt to program Huawei and Cyclades routers, and also to set up linux ruters.
That was about 2 years ago.... so i am reading again my materials to take the CCNA.

Also, I recently got a new job at NEC (as a junior engineer) and i was checking the routers configurations.

Maybe if i am more explicit with the questions......

Only the first 3 octects can have any value. ????
I. What do these mean:
1. access-list 115 permit ip 0.0.0.0 255.255.255.0 any

The pool test has 2 private ip addresses assigned.
There is a static NAT configuration. 10.10.10.4 is the local inside and will turn to 172.16.6.14 as global inside.
I do not understand the last line. I think it is incomplete. an ACL is missing. ?????
2. ip nat pool test 172.16.11.70 172.16.11.71 prefix-lenght 24
ip nat inside source static 10.10.10.4 172.16.6.14
ip nat inside source pool test

NBMA is Frame Relay
BMA is ethernet
Non broadcats and broadcast multipoint, can be both. As subinterfaces can be configured and IPv6 does not allow broadcast ??????
II. Besides Non-broadcast and broadcast multiaccess, there are
also the non-broadcast and broadcast multipoint. What is the
difference? are there any drawings?


Serial interfaces do not have MAC address, as the links are point to point. But what will appear in the MAC address table when the packet is crossing the serial interface? Is there a way to know that? Maybe in Frame Relay?
III. Scenario: I have 2 routers kinked by a serial interface (every
router has its own lan networks too). When a packet sent from
one of these LAN networks is traversing the serial link; What
would be the source and destiny MAC address?


1. Can there be a trunk link between a server and a switch?
2. Are broadcasts always ARP packets?
3. Is WINDOWING of L4 related to FECN and BECN?
4. Are MTU only for L4? How can be controlled the size of packets or
frames?
5. DNS uses port 53 in TCP and UDP. UDP when the IP is alredy in
cache, TCP to ask other DNS servers?
6. ASBR (autonomous system border routers) use EGP to
communicate between each other?

Regards