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51 Which addresses are
INCORRECTLY paired with their class?
A. 240 - 255, Class D
B. 240 - 255, Class E
C. 224 - 239, Class D
D. 224 - 239, Class E
Ans A & D
Address classes are: 1 to 126, Class A; 128 to 191, Class B, 192
to 223, Class C; 224 to 239, Class D; and 240 to 255, Class E.
52 Which IP Address Class is INCORRECTLY paired with its
range of network numbers?
A. Class A addresses include 192.0.0.0 through 223.255.255.0
B. Class A addresses include 1.0.0.0 through 126.0.0.0
C. Class B addresses include 128.0.0.0 through 191.255.0.0
D. Class C addresses include 192.0.0.0 through 223.255.255.0
E. Class D addresses include 224.0.0.0 through 239.255.255.0
Ans A
Class A addresses include 1.0.0.0 through 126.0.0.0
Class B addresses include 128.0.0.0 through 191.255.0.0
Class C addresses include 192.0.0.0 through 223.255.255.0
Class D addresses include 224.0.0.0 through 239.255.255.0
53 Which IP Address Class can have 16 million subnets but
support 254 hosts?
A. Class C
B. Class A
C. Class B
D. Class D
Ans A
Possible Subnets IP Address Class Possible Hosts
254 A 16M.
64K B 64K
16M C 254
54 Which IP Address Class can have 64,000 subnets with 64,000
hosts per subnet?
A. Class B
B. Class A
C. Class C
D. Class D
Ans A
IP Address Class Possible Subnets Possible Hosts
254 A 16M
64K B 64K
16M C 254
55 There are two processes to pair MAC address with IP
addresses. Which process finds an IP address from a MAC address?
A. RARP
B. ARP
C. RIP
D. IGRP
Ans A
ARP (Address Resolution Protocol) maps an IP address to the MAC
address, RARP (Reverse Address Resolution Protocol) maps the MAC
address to the IP address. ARP and RARP work at the internet
layer of the Internet Model or the network layer of the OSI
model.
56 When the router runs out of buffer space, this is called
________.
A. Source Quench
B. Redirect
C. Information Request
D. Low Memory
Ans A
Source quench is the process where the destination router, or
end internetworking device will "quench" the date from the
"source", or the source router. This usually happens when the
destination router runs out of buffer space to process packets.
57 Which protocol carries messages such as destination
Unreachable, Time Exceeded, Parameter Problem, Source Quench,
Redirect, Echo, Echo Reply, Timestamp, Information Request,
Information Reply, Address Request, and Address Reply?
A. ICMP
B. UDP
C. TCP
D. TFTP
E. FTP
Ans A
ICMP (Internet Control Message Protocol) is a network layer
internet protocol described in RFC # 792. ICMP reports IP packet
information such as destination Unreachable, Time Exceeded,
Parameter Problem, Source Quench, Redirect, Echo, Echo Reply,
Timestamp, Information Request, Information Reply, Address
Request, and Address Reply.
58 Two of the protocols that can be carried in the Protocol
field of an IP packet are?
A. TCP
B. UDP
C. FTP
D. TFTP
Ans A & B
The following are the fields in an IP segment,
their length, and their definitions:
VERS (Version number - 16 bits)
HLEN (Number of 32-bit words in the header - 4 bits)
Type of Server (How the datagram should be handled - 32 bits)
Total Length (Total length of header and data - 32 bits)
Identification (Provide fragmentation of datagrams to allow
different MTUs in the internet - 4 bits)
Flags (Provide fragmentation of datagrams to allow different
MTUs in the internet - 4 bits)
Frag Offset (Provide fragmentation of datagrams to allow
different MTUs in the internet - 6 bits)
TTL (Time-To-Live - 6 bits)
Protocol (Upperlayer protocol sending the datagram - 16 bits)
Header Checksum )Integrity check on the header - 16 bits)
Source IP Address (32 bits)
Destination IP Address (32 bits)
IP Options (network testing, debugging, security and others - 4
bits)
Data (4 bits).
59 Where would network testing be included in an IP packet?
A. IP Options field
B. Identification field
C. Type of Service field
D. Reservation field
Ans A
The following are the fields in an IP segment, their length, and
their definitions:
VERS (Version number - 16 bits)
HLEN (Number of 32-bit words in the header - 4 bits)
Type of Server (How the datagram should be handled - 32 bits)
Total Length (Total length of header and data - 32 bits)
Identification (Provide fragmentation of datagrams to allow
different MTUs in the internet - 4 bits)
Flags (Provide fragmentation of datagrams to allow different
MTUs in the internet - 4 bits)
Frag Offset (Provide fragmentation of datagrams to allow
different MTUs in the internet - 6 bits)
TTL (Time-To-Live - 6 bits)
Protocol (Upperlayer protocol sending the datagram - 16 bits)
Header Checksum )Integrity check on the header - 16 bits)
Source IP Address (32 bits)
Destination IP Address (32 bits)
IP Options (network testing, debugging, security and others - 4
bits)
Data (4 bits).
60 What field tells the Internet layer how to handle an IP
packet?
A. Type of Service
B. Identification
C. Flags
D. Frag Offset
Ans A
The following are the fields in an IP segment, their length, and
their definitions:
VERS (Version number - 16 bits)
HLEN (Number of 32-bit words in the header - 4 bits)
Type of Server (How the datagram should be handled - 32 bits)
Total Length (Total length of header and data - 32 bits)
Identification (Provide fragmentation of datagrams to allow
different MTUs in the internet - 4 bits)
Flags (Provide fragmentation of datagrams to allow different
MTUs in the internet - 4 bits)
Frag Offset (Provide fragmentation of datagrams to allow
different MTUs in the internet - 6 bits)
TTL (Time-To-Live - 6 bits)
Protocol (Upperlayer protocol sending the datagram - 16 bits)
Header Checksum )Integrity check on the header - 16 bits)
Source IP Address (32 bits)
Destination IP Address (32 bits)
IP Options (network testing, debugging, security and others - 4
bits) Data (4 bits).
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