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IPV4 Addressing

Subject : it-skills

Instructions:

Answer 50 questions in 15 minutes.
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Match each statement with the correct term.
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This is a study tool. The 3 wrong answers for each question are randomly chosen from answers to other questions. So, you might find at times the answers obvious, but you will see it re-enforces your understanding as you take the test each time.

1. Which RFC defines the special use IPv4 address ranges?
RFC 3330
Router(config)#arp {ip-address} {mac-address} arpa
Length of header in words (32-bit)
Hardware type (16-bit); Protocol type (16-bit); Hardware address length (8-bit); Protocol address length (8-bit); Operation (16-bit); Sender hardware address; Sender protocol address; Target hardware address; Target protocol address

2. What is ICMP Type 5?
88
Internet Protocol
Internet Control Message Protocol
Redirect

3. What is the most commonly used Option field in the TCP header?
Open Systems Interconnection
More Fragments follow
Maximum Segment Size (MSS)
Push

4. What is prefix /25 in decimal notation?
6
Destination Unreachable
255.255.255.128
Router(config-if)#no ip proxy-arp

5. What is the IPv4 Protocol number for GRE?
198.18.0.0/15
255.255.255.224
47
4

6. What IPv4 header fields are used for fragmentation?
Address Resolution Protocol
Identifier; Flags and Fragmentation Offset
3
Reserved (1-bit); DF (1-bit); MF (1-bit)

7. What is the format of an IPv4 header?
Version (4-bit); Header Length (4-bit); ToS (8-bit); Total Length (16-bit); Identifier (16-bit); Flags (3-bit); Fragment Offset (13-bit); TTL (8-bit); Protocol (8-bit); Header Checksum (16-bit); Source Address (32-bit); Destination Address (32-bit);
0
Number of octets - starting with the octet indicated by the Acknowledgement Number - that the receiver will accept from the sender before the sender must stop transmitting and wait for a new Acknowledgement
Internet Corporation for Assigned Network Numbers

8. Which IPv4 address range is reserved for IPv6 to IPv4 (6to4) relays (RFC 3068)?
47
192.88.99.0/24
RIRs
255.255.255.128

9. What is the prerequisite for using the Urgent Pointer field in the TCP header?
Regional Internet Registry
0
URG flag set
Destination Unreachable

10. What is the first octet rule for IPv4 address classes in binary?
Offset - in units of eight octets - from the beginning of the original header to the beginning of the fragment
Class A 0; Class B 10; Class C 110; Class D 1110; Class E 1111
Maximum Segment Size (MSS)
CWR (1-bit); ECE (1-bit); URG (1-bit); ACK (1-bit); PSH (1-bit); RST (1-bit); SYN (1-bit); FIN (1-bit)

11. What is the format of the TCP Header Length field?
20 octets
Length of header in words (32-bit)
88
Protocols that include subnet masks in their routing updates

12. What is the ARP Protocol type value for IPv4?
ECN-Echo
More Fragments follow
Address Resolution Protocol
0x0800

13. What are the IP Precedence values?
2
6
9
0 Routine; 1 Priority; 2 Immediate; 3 Flash; 4 Flash Override; 5 Critical; 6 Internetwork Control; 7 Network Control

14. What is the the MF-bit in the IPv4 header?
More Fragments follow
IANA
Duplicate address checks; Advertise new data-link identifiers; Update the ARP caches of hosts
9

15. What is the maximum length of an IPv4 header?
Identifier; Flags and Fragmentation Offset
Used by IRDP on some operating systems to discover local routers
60 octets
Address Resolution Protocol

16. What are classless routing protocols?
Identifier; Flags and Fragmentation Offset
Protocols that include subnet masks in their routing updates
Echo
Open Systems Interconnection

17. What is the IPv4 Protocol number for EIGRP?
88
Router#show arp
ECN-Echo
Maximum Segment Size (MSS)

18. What is IP?
Internet Protocol
4
Router(config)#ip netmask-format {bit-count | decimal | hexadecimal}
Router#clear arp-cache [{interface {interface}} | {ip-address}]

19. What is the format of a TCP header?
1
127.0.0.0/8
Urgent
Source Port (16-bit); Destination Port (16-bit); Sequence Number (32-bit); Acknowledgement Number (32-bit); Header Length (4-bit); Reserved (4-bit); Flags (8-bit); Windows Size (16-bit); Checksum (16-bit); Urgent Pointer (16-bit); Options; Padding

20. What are classful routing protocols?

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21. How can the receiver determine the size of a packet's data payload based on the IPv4 header?
127.0.0.0/8
RIRs
Subtract Header Length field from Total Length field
Reserved (1-bit); DF (1-bit); MF (1-bit)

22. What is Reverse ARP?
Class A 1-126; Class B 128-191; Class C 192-223; Class D 224-239; Class E 240-254
The next sequence number that the source expects to receive from the destination
Echo Reply
Used by a host to obtain the IPv4 address associated with its own MAC address

23. What is the ARP Operation value for an ARP Request?
ICMP Router Discovery Protocol
Reserved (1-bit); DF (1-bit); MF (1-bit)
1
198.18.0.0/15

24. What is RST?
4
ICANN and IANA
Internet
Reset

25. What is the function of ICMP router advertisement and router selection messages?
Redirect
Don't Fragment
1
Used by IRDP on some operating systems to discover local routers

26. Enables debugging output for ARP transactions
Data Offset
Socket
Destination Unreachable
Router#debug arp

27. What is the purpose of a socket?
17
1
Uniquely identify every application in the network
255.255.255.192

28. What is ICMP?
255.255.255.252
Internet Control Message Protocol
Identifier; Flags and Fragmentation Offset
Network interface

29. What is Inverse ARP?

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30. What is prefix /30 in decimal notation?
4
Internet Control Message Protocol
Used by IRDP on some operating systems to discover local routers
255.255.255.252

31. What is URG?
255.255.255.248
Urgent
Class A 1-126; Class B 128-191; Class C 192-223; Class D 224-239; Class E 240-254
1

32. What is ICMP Type 11?
Protocols that include subnet masks in their routing updates
Open Systems Interconnection
Time Exceeded
IANA

33. What is the DF-bit in the IPv4 header?

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34. What routing protocols are classful?
RIPv1 and IGRP
ICANN and IANA
89
Duplicate address checks; Advertise new data-link identifiers; Update the ARP caches of hosts

35. What are the private IPv4 address ranges?
Windowing
10.0.0.0/8; 172.16.0.0/12; 192.168.0.0/16
2
IANA

36. What is the ARP Operation value for a Reverse ARP Reply?
169.254.0.0/16
Internet Corporation for Assigned Network Numbers
4
IANA

37. What mechanism is used by TCP to provided ordered segment delivery?
Router#show arp
Sequence Numbers
Don't Fragment
1-2 Network interface; 3 Internet; 4 Host-to-host; 5-7 Application

38. What is the ARP Operation value for an ARP Reply?
198.18.0.0/15
2
Maximum Segment Size (MSS)
Network interface

39. What is LIR?
Local Internet Registry
RFC 3330
IPv4 and IPv6
Socket

40. What is the ARP Protocol address length value for IPv4?
Host-to-host
4
127.0.0.0/8
Router(config)#ip arp proxy disable

41. What is the IPv4 Protocol number for IP in IP encapsulation?
Router Selection
The next sequence number that the source expects to receive from the destination
Used by routers to notify hosts of another router on the data link that should be used for a particular destination
4

42. What is RIR?
Regional Internet Registry
2
Version (4-bit); Header Length (4-bit); ToS (8-bit); Total Length (16-bit); Identifier (16-bit); Flags (3-bit); Fragment Offset (13-bit); TTL (8-bit); Protocol (8-bit); Header Checksum (16-bit); Source Address (32-bit); Destination Address (32-bit);
Used by routers to notify hosts of another router on the data link that should be used for a particular destination

43. Which IPv4 address range is reserved for self-identification on a local subnet?
0.0.0.0/8
1
Type (8-bit); Code (8-bit); Checksum (16-bit); Variable fields
Congestion Window Reduced

44. What field identifies where the TCP encapsulated data fits within the data stream from the sender?
RIPv1 and IGRP
Reserved (1-bit); DF (1-bit); MF (1-bit)
Sequence Number
Router Advertisement

45. What is prefix /29 in decimal notation?
1
Router(config)#ip arp proxy disable
Internet Service Provider
255.255.255.248

46. What is the format of the ToS byte in the IPv4 header?
Used by routers to notify hosts of another router on the data link that should be used for a particular destination
Mostly large ISPs - enterprises - or academic institutions
255.255.255.240
IP Precedence (3-bit); ToS (4-bit); Reserved (1-bit)

47. What are the protocol categories that describe the physical layer?
Synchronize
4
Electrical/Optical - Mechanical - Functional and Procedural
Network interface

48. What is covered by the TCP Checksum field?
RIRs
Internet Protocol
169.254.0.0/16
Both the TCP header and the encapsulated data

49. What is IRDP?
Subtract Header Length field from Total Length field
Padding of zeros to ensure that the header ends on a 32-bit boundary
ICMP Router Discovery Protocol
CWR (1-bit); ECE (1-bit); URG (1-bit); ACK (1-bit); PSH (1-bit); RST (1-bit); SYN (1-bit); FIN (1-bit)

50. What is the first octet rule for IPv4 address classes in decimal?
4
Class A 1-126; Class B 128-191; Class C 192-223; Class D 224-239; Class E 240-254
Source Port (16-bit); Destination Port (16-bit); Sequence Number (32-bit); Acknowledgement Number (32-bit); Header Length (4-bit); Reserved (4-bit); Flags (8-bit); Windows Size (16-bit); Checksum (16-bit); Urgent Pointer (16-bit); Options; Padding
An ARP request issued by a host with its own IPv4 address as the target address