Information Technology Reference
In-Depth Information
3.
D. Loopback addresses should have a /32 mask so that address space is not wasted.
4.
C. The precedence bits are located in the Type of Service field of the IPv4 header.
5.
B. Multicast addresses range from 224.0.0.1 to 239.255.255.255.
6.
D. The summary route summarizes subnetworks from 150.10.192.0/24 to
150.10.198.0/24. Answer c is the only answer that includes them.
7.
D. Point-to-point links need only two host addresses; use a /30 mask, which provides
22 - 2 = 2 host addresses.
8.
C. DHCP assigns IP addresses dynamically.
9.
C. Static NAT is used to statically translate public IP addresses to private IP addresses.
10.
C. The DS field allocates 6 bits in the ToS field, thus making it capable of 64 distinct
codepoints.
Q&A
1.
10/8, 172.16/12 (172.16.0.0 to 172.31.255.255), and 192.168/16
2.
Tr ue. You c an u s e DHCP to s pec ify s everal ho st IP config urat ion parameter s, includ-
ing IP address, mask, default gateway, DNS servers, and TFTP server.
3.
False. The bit-number representation of 255.255.255.248 is /29. /28 is the same mask
as 255.255.255.240.
4.
Tr ue
5.
20 (bytes)
6.
DSCP uses 6 bits, which provides 64 levels of classification.
7.
Tr ue
8.
False. The header checksum field only includes a checksum of the IP header; it does
not check the data portion.
9.
The subnet is 172.56.4.0/22, the address range is from 172.56.4.1 to 172.56.7.254, and
the subnet broadcast is 172.56.7.255.
10.
The IP layer in the destination host.
11.
B. DHCP configures the IP address, subnet mask, default gateway, and other optional
parameters.
12.
C. Class B networks have 16 bits for host addresses with the default mask:
216 - 2 = 65,534.
13.
B. A /26 mask has 26 network bits and 6 host bits.
14.
C. Network 192.170.20.16 with a prefix of /29 summarizes addresses from
192.170.20.16 to 192.170.20.23.
15.
