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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.
Don't refresh. All questions and answers are randomly picked and ordered every time you load a test.

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. What is the name of the queuing and forwarding of IP packets based on DiffServ?
Per-Hop Behaviour (PHB)
4
Internet
255.255.255.224

2. What is the ARP Operation value for an ARP Request?
Type (8-bit); Code (8-bit); Checksum (16-bit); Variable fields
All Internet Registries
Regional Internet Registry
1

3. What is IANA?
Internet Assigned Numbers Authority
64
Uniquely identify every application in the network
Sequence Number + Data payload octets + 1

4. What is the ARP Operation value for an Inverse ARP Reply?
Transmission Control Protocol
IP Precedence (3-bit); ToS (4-bit); Reserved (1-bit)
4
9

5. What is IRDP?
ICMP Router Discovery Protocol
Loose source routing; Strict source routing; Record route; Timestamp
Used by routers to notify hosts of another router on the data link that should be used for a particular destination
An ARP request issued by a host with its own IPv4 address as the target address

6. Disables proxy ARP on all interfaces
Regional Internet Registry
255.255.255.192
Time to Live
Router(config)#ip arp proxy disable

7. What is the IPv4 Protocol number for TCP?
0 Routine; 1 Priority; 2 Immediate; 3 Flash; 4 Flash Override; 5 Critical; 6 Internetwork Control; 7 Network Control
6
Source Port (16-bit); Destination Port (16-bit); UDP Length (16-bit); Checksum (16-bit)
Router(config)#ip netmask-format {bit-count | decimal | hexadecimal}

8. What is TCP?
Duplicate address checks; Advertise new data-link identifiers; Update the ARP caches of hosts
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
Transmission Control Protocol
IP Precedence (3-bit); ToS (4-bit); Reserved (1-bit)

9. What is ICMP Type 10?
Padding of zeros to ensure that the header ends on a 32-bit boundary
Router#debug arp
Sequence Number + Data payload octets + 1
Router Selection

10. What is the content of the TCP Window Size field?
RIRs
Reserved (1-bit); DF (1-bit); MF (1-bit)
Time Exceeded
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

11. Adds a permanent static ARP entry for an Ethernet host
Router(config)#arp {ip-address} {mac-address} arpa
4
Echo
LIRs

12. What TCP/IP protocol suite layer corresponds to the network layer of the OSI model?
Largest segment size that the sender is willing to accept
Used by a host to obtain the IP address associated with another host's MAC address
Internet
1 Determine how many subnets are required; 2 Determine how many hosts per subnet are required; 3 Determine the subnet mask for each subnet; 4 Calculate the network address for each subnet

13. What are the uses of gratuitous ARP?
Duplicate address checks; Advertise new data-link identifiers; Update the ARP caches of hosts
Router(config-if)#no ip proxy-arp
RIRs
Final

14. What is prefix /27 in decimal notation?
255.255.255.224
Duplicate address checks; Advertise new data-link identifiers; Update the ARP caches of hosts
46
Don't Fragment

15. Specifies the format in which subnet masks are displayed in show command output
Protocols that don't include subnet masks in their routing updates
Router(config)#ip netmask-format {bit-count | decimal | hexadecimal}
Final
192.0.2.0/24

16. What mechanisms are used by TCP to provide reliable segment delivery?
RIRs
255.255.255.128
4
Acknowledgements - checksums and timers

17. What is the content of the Maximum Segment Size (MSS) in the Option field of the TCP header?
1
Used by a host to obtain the IPv4 address associated with its own MAC address
Minimize Delay (1-bit); Maximise Throughput (1-bit); Maximise Reliability (1-bit); Minimize Monetary Cost (1-bit)
Largest segment size that the sender is willing to accept

18. What is the IPv4 Protocol number of RSVP?
Transmission Control Protocol
198.18.0.0/15
46
Time Exceeded

19. What is the first octet rule for IPv4 address classes in binary?
Per-Hop Behaviour (PHB)
Subtract Header Length field from Total Length field
Class A 0; Class B 10; Class C 110; Class D 1110; Class E 1111
IPv4 and IPv6

20. What mechanism is used by TCP to regulate the flow of segments?
3
Subtract Header Length field from Total Length field
Windowing
0

21. What is Reverse ARP?
Used by a host to obtain the IPv4 address associated with its own MAC address
10.0.0.0/8; 172.16.0.0/12; 192.168.0.0/16
RFC 1918
Congestion Window Reduced

22. What is NIR?
2
Router(config)#arp {ip-address} {mac-address} arpa
National Internet Registry
Largest segment size that the sender is willing to accept

23. What is the function of ICMP redirect messages?
Used by routers to notify hosts of another router on the data link that should be used for a particular destination
Acknowledgement
Uniquely identify every application in the network
All Internet Registries

24. What is the prerequisite for using the Urgent Pointer field in the TCP header?
URG flag set
Redirect
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
8

25. What is the ARP Protocol type value for IPv4?
ECN-Echo
Protocols that include subnet masks in their routing updates
Socket
0x0800

26. What is the ARP Operation value for an Inverse ARP Request?
Sequence Numbers
Used by routers to notify hosts of another router on the data link that should be used for a particular destination
8
Regional Internet Registry

27. What is the format of the DiffServ byte?
0 Routine; 1 Priority; 2 Immediate; 3 Flash; 4 Flash Override; 5 Critical; 6 Internetwork Control; 7 Network Control
DSCP (6-bit); ECN (2-bit)
Duplicate address checks; Advertise new data-link identifiers; Update the ARP caches of hosts
Redirect

28. What is prefix /26 in decimal notation?
Padding of zeros to ensure that the header ends on a 32-bit boundary
Local Internet Registry
255.255.255.192
Sequence Numbers

29. What are classless routing protocols?
169.254.0.0/16
4
Protocols that include subnet masks in their routing updates
Identifier; Flags and Fragmentation Offset

30. Who is responsible for the global coordination of the DNS Root - IP addressing - and other Internet protocol resources?
0.0.0.0/8
IPv4 and IPv6
IANA
89

31. Which RFC defines IPv4?
Protocols that include subnet masks in their routing updates
RFC 1918
Router(config)#arp {ip-address} {mac-address} arpa
RFC 791

32. What is the IPv4 Protocol number for EIGRP?
IANA
Sequence Numbers
88
Per-Hop Behaviour (PHB)

33. Configures how long a dynamically learned protocol address and its corresponding hardware address remains in the ARP cache
2
IANA
Router(config-if)#arp timeout {seconds}
Used by a host to obtain the IP address associated with another host's MAC address

34. What is the Fragment Offset field in the IPv4 header?
Offset - in units of eight octets - from the beginning of the original header to the beginning of the fragment
ICANN and IANA
Final
Application

35. What is the most commonly used Option field in the TCP header?
1
Padding of zeros to ensure that the header ends on a 32-bit boundary
RIRs
Maximum Segment Size (MSS)

36. What is the TTL field in the IPv4 header?
DHCP
0
Time to Live
Maximum Segment Size (MSS)

37. Which IPv4 address range is reserved for use in documentation and example code?
Both the TCP header and the encapsulated data
2
192.0.2.0/24
Echo Reply

38. Which RFC defines the special use IPv4 address ranges?
255.255.255.128
Destination Unreachable
RFC 3330
RFC 1918

39. What is LIR?
Local Internet Registry
8
Uniquely identify every application in the network
Minimize Delay (1-bit); Maximise Throughput (1-bit); Maximise Reliability (1-bit); Minimize Monetary Cost (1-bit)

40. What is the format of the Flags field in the TCP header?
LIRs
Regional Internet Registry
The next sequence number that the source expects to receive from the destination
CWR (1-bit); ECE (1-bit); URG (1-bit); ACK (1-bit); PSH (1-bit); RST (1-bit); SYN (1-bit); FIN (1-bit)

41. What is ECE?
ECN-Echo
255.255.255.224
Minimize Delay (1-bit); Maximise Throughput (1-bit); Maximise Reliability (1-bit); Minimize Monetary Cost (1-bit)
Sequence Numbers

42. What is the minimum length of an IPv4 header?
Time to Live
192.88.99.0/24
20 octets
Router Selection

43. What is IP?
Router(config)#ip arp proxy disable
127.0.0.0/8
2
Internet Protocol

44. What is the the MF-bit in the IPv4 header?
255.255.255.224
Local Internet Registry
More Fragments follow
Largest segment size that the sender is willing to accept

45. What is ICMP Type 5?
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
Reserved (1-bit); DF (1-bit); MF (1-bit)
Redirect
Local Internet Registry

46. What is FIN?
Final
0
Number of octets to be added to the Sequence Number to indicate the end of the urgent data
Used by routers to notify hosts of another router on the data link that should be used for a particular destination

47. What is the content of the the Urgent Pointer field in the TCP header?
Number of octets to be added to the Sequence Number to indicate the end of the urgent data
CWR (1-bit); ECE (1-bit); URG (1-bit); ACK (1-bit); PSH (1-bit); RST (1-bit); SYN (1-bit); FIN (1-bit)
6
Socket

48. What are the protocol categories that describe the physical layer?
Electrical/Optical - Mechanical - Functional and Procedural
255.255.255.252
10.0.0.0/8; 172.16.0.0/12; 192.168.0.0/16
ICANN and IANA

49. What is prefix /30 in decimal notation?
255.255.255.252
Router Selection
4
Used by a host to obtain the IPv4 address associated with its own MAC address

50. What is the function of ICMP router advertisement and router selection messages?
198.18.0.0/15
Push
Used by IRDP on some operating systems to discover local routers
Type (8-bit); Code (8-bit); Checksum (16-bit); Variable fields