check my answers for Local Area Networking

I came up with these answers, can please check my answers

my answers in bold

____________________________________________________________________________________________________________________________________________

III. Here, There, Everwhere

A. Which of the following CIDR blocks cover the address 171.15.66.234? Check all that apply.

128.0.0.0/1

128.0.0.0/2

171.15.0.0/16

171.15.0.0/17

171.15.0.0/18

171.16.55.128/26

171.15.66.0/28

171.15.66.234/32

_____________________________________________________________________________________

B. True or false: IPv6 addresses are in short supply.

True

False

_____________________________________________________________________________________

C. True or false: using DHCP is the only way for a host to obtain an IP address today in the Internet.

True

False

_____________________________________________________________________________________

D. True or false: because it uses a link layer broadcast, in order to receive a response a node using DHCP must be on the same link as its DHCP server.

True

False

_____________________________________________________________________________________

E. True or false: because DHCP uses link layer broadcasts, the IP gateway for a subnet must also be a DHCP server.

True

False

____________________________________________________________________________________

F. DHCP is a layer 3 (network layer) protocol

True

False

_____________________________________________________________________________________

G. Mark all of the following that are syntactically valid IPv6 addresses:

2001:470::806d:1::9

64:ff9b::171.66.3.9

65:aagg:54::22:12.44.11.99

dead:beef:10:10.44.12.22::9

fe80::6aa8:6dff:fe05:8522

fe80::213:72ff:fe4c:d96a

_____________________________________________________________________________________

H. True or false: It is considered good practice for Network Address Translators to map a single external IP/port pair to multiple internal IP/port pairs.

True

False

_____________________________________________________________________________________

I. True or false: Network Address Translators cannot be layered. I.e., if you have two layers of NAT between a pair of hosts, all IP communication will break.

True

False