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IPV4 Addressing

Subject : it-skills

Instructions:

Answer 50 questions in 15 minutes.
If you are not ready to take this test, you can study here.
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. How can the receiver determine the size of a packet's data payload based on the IPv4 header?
IANA
Internet
Subtract Header Length field from Total Length field
Internet Assigned Numbers Authority

2. What is the ARP Hardware type value for Ethernet?
Length of header in words (32-bit)
1
Router#clear arp-cache [{interface {interface}} | {ip-address}]
192.0.2.0/24

3. What are classless routing protocols?
0x0800
Protocols that include subnet masks in their routing updates
Router(config-if)#arp timeout {seconds}
DHCP

4. What is prefix /28 in decimal notation?
Urgent
255.255.255.240
88
Class A 1-126; Class B 128-191; Class C 192-223; Class D 224-239; Class E 240-254

5. Disables proxy ARP on all interfaces
Router#clear arp-cache [{interface {interface}} | {ip-address}]
Router(config)#ip arp proxy disable
Class A 0; Class B 10; Class C 110; Class D 1110; Class E 1111
255.255.255.252

6. What is the other name for the TCP Header Length field?
RFC 1918
255.255.255.192
Router#clear arp-cache [{interface {interface}} | {ip-address}]
Data Offset

7. What are the steps to subnet an IPv4 address?
Internet Assigned Numbers Authority
Used by a host to obtain the IP address associated with another host's MAC address
0.0.0.0/8
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

8. What is proxy ARP?
CWR (1-bit); ECE (1-bit); URG (1-bit); ACK (1-bit); PSH (1-bit); RST (1-bit); SYN (1-bit); FIN (1-bit)
Method where routers - by responding to ARP requests for IP addresses in different subnets - make themselves available to hosts with no default gateway configured
0.0.0.0/8
0x0800

9. What is the difference between the ToS and the DiffServ byte?
4
Both the TCP header and the encapsulated data
Internet Corporation for Assigned Network Numbers
They are the same byte - but the names and value interpretations are different

10. Which RFC defines the private IPv4 address ranges?
CWR (1-bit); ECE (1-bit); URG (1-bit); ACK (1-bit); PSH (1-bit); RST (1-bit); SYN (1-bit); FIN (1-bit)
Address Resolution Protocol
RFC 1918
Internet

11. What field identifies where the TCP encapsulated data fits within the data stream from the sender?
RIPv1 and IGRP
Sequence Number
Router(config-if)#no ip redirects
Router(config-if)#no ip proxy-arp

12. What is the ARP Operation value for a Reverse ARP Reply?
LIRs
4
Used by IRDP on some operating systems to discover local routers
Class A 1-126; Class B 128-191; Class C 192-223; Class D 224-239; Class E 240-254

13. What is RST?
64
ICANN and IANA
192.0.2.0/24
Reset

14. Who are LIRs?
Mostly large ISPs - enterprises - or academic institutions
DHCP
255.255.255.224
88

15. What is Inverse ARP?

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16. What is the most commonly used Option field in the TCP header?
Acknowledgements - checksums and timers
RIRs
Maximum Segment Size (MSS)
Reset

17. What is SYN?
Protocols that include subnet masks in their routing updates
Maximum Segment Size (MSS)
Synchronize
Time Exceeded

18. What are the IP Precedence values?
Internet Protocol
RFC 3330
Internet Corporation for Assigned Network Numbers
0 Routine; 1 Priority; 2 Immediate; 3 Flash; 4 Flash Override; 5 Critical; 6 Internetwork Control; 7 Network Control

19. What is RIR?
ECN-Echo
Regional Internet Registry
Mostly large ISPs - enterprises - or academic institutions
Push

20. What is the ARP Operation value for an ARP Request?
ECN-Echo
1
Internet
Method where routers - by responding to ARP requests for IP addresses in different subnets - make themselves available to hosts with no default gateway configured

21. What is URG?
20 octets
Urgent
Largest segment size that the sender is willing to accept
Destination Unreachable

22. What is the first octet rule for IPv4 address classes in binary?
Mostly large ISPs - enterprises - or academic institutions
Class A 0; Class B 10; Class C 110; Class D 1110; Class E 1111
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);
255.255.255.128

23. What is added after the Option field in the TCP header?
NIRs
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
DSCP (6-bit); ECN (2-bit)
Padding of zeros to ensure that the header ends on a 32-bit boundary

24. What is the ARP Operation value for an Inverse ARP Reply?
9
Time Exceeded
Loose source routing; Strict source routing; Record route; Timestamp
60 octets

25. Which RFC defines the special use IPv4 address ranges?
They are the same byte - but the names and value interpretations are different
6
RFC 3330
Used by a host to obtain the IPv4 address associated with its own MAC address

26. What is the IPv4 Protocol number for IGMP?
2
Host-to-host
Time Exceeded
Sequence Number + Data payload octets + 1

27. What is the format of the Flags field in the TCP header?
Maximum Segment Size (MSS)
RFC 3330
Largest segment size that the sender is willing to accept
CWR (1-bit); ECE (1-bit); URG (1-bit); ACK (1-bit); PSH (1-bit); RST (1-bit); SYN (1-bit); FIN (1-bit)

28. What is the IPv4 Protocol number for GRE?
IP Precedence (3-bit); ToS (4-bit); Reserved (1-bit)
IANA
ICANN
47

29. What is a TCP port number of an application called when it is coupled with the IP address of the server?
127.0.0.0/8
RIPv1 and IGRP
Padding of zeros to ensure that the header ends on a 32-bit boundary
Socket

30. What is the format of a UDP header?
Source Port (16-bit); Destination Port (16-bit); UDP Length (16-bit); Checksum (16-bit)
Length of header in words (32-bit)
Internet Assigned Numbers Authority
Reserved (1-bit); DF (1-bit); MF (1-bit)

31. What is a TCP Acknowledgement Number?
169.254.0.0/16
They are the same byte - but the names and value interpretations are different
The next sequence number that the source expects to receive from the destination
Method where routers - by responding to ARP requests for IP addresses in different subnets - make themselves available to hosts with no default gateway configured

32. What is ACK?
Acknowledgement
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);
IANA
Local Internet Registry

33. Who allocates public IP address ranges to NIRs or LIRs?
Regional Internet Registry
Subtract Header Length field from Total Length field
RIRs
DSCP (6-bit); ECN (2-bit)

34. Disables proxy ARP on an interface
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
Loose source routing; Strict source routing; Record route; Timestamp
Router(config-if)#no ip proxy-arp
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

35. What is FIN?
Final
Time to Live
1
255.255.255.128

36. Who is responsible for the global coordination of the DNS Root - IP addressing - and other Internet protocol resources?
Reset
Acknowledgements - checksums and timers
They are the same byte - but the names and value interpretations are different
IANA

37. What is the format of an IPv4 header?
Don't Fragment
4
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);
ICANN

38. What is ICMP Type 9?
NIRs
Time to Live
ICMP Router Discovery Protocol
Router Advertisement

39. What is the format of the ToS field?
ICMP Router Discovery Protocol
IP Precedence (3-bit); ToS (4-bit); Reserved (1-bit)
Padding of zeros to ensure that the header ends on a 32-bit boundary
Minimize Delay (1-bit); Maximise Throughput (1-bit); Maximise Reliability (1-bit); Minimize Monetary Cost (1-bit)

40. What is CWR?
Router(config)#arp {ip-address} {mac-address} arpa
Congestion Window Reduced
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
RFC 1918

41. What is the prerequisite for using the Urgent Pointer field in the TCP header?
URG flag set
An ARP request issued by a host with its own IPv4 address as the target address
1-2 Network interface; 3 Internet; 4 Host-to-host; 5-7 Application
Subtract Header Length field from Total Length field

42. What is the IPv4 Protocol number for OSPF?
0 Routine; 1 Priority; 2 Immediate; 3 Flash; 4 Flash Override; 5 Critical; 6 Internetwork Control; 7 Network Control
89
LIRs
Router#clear arp-cache [{interface {interface}} | {ip-address}]

43. What are the uses of gratuitous ARP?
Duplicate address checks; Advertise new data-link identifiers; Update the ARP caches of hosts
Type (8-bit); Code (8-bit); Checksum (16-bit); Variable fields
1
URG flag set

44. What mechanisms are used by TCP to provide reliable segment delivery?
255.255.255.252
LIRs
Acknowledgements - checksums and timers
1-2 Network interface; 3 Internet; 4 Host-to-host; 5-7 Application

45. What is OSI?
169.254.0.0/16
Loose source routing; Strict source routing; Record route; Timestamp
Address Resolution Protocol
Open Systems Interconnection

46. What is the format of a TCP header?
CWR (1-bit); ECE (1-bit); URG (1-bit); ACK (1-bit); PSH (1-bit); RST (1-bit); SYN (1-bit); FIN (1-bit)
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
255.255.255.252
Router#clear arp-cache [{interface {interface}} | {ip-address}]

47. How does the layers of the TCP/IP protocol suite map to the 7 layers of the OSI model?
Number of octets to be added to the Sequence Number to indicate the end of the urgent data
Host-to-host
1-2 Network interface; 3 Internet; 4 Host-to-host; 5-7 Application
255.255.255.224

48. Deletes dynamic entries from the ARP cache
Router#clear arp-cache [{interface {interface}} | {ip-address}]
Reserved (1-bit); DF (1-bit); MF (1-bit)
Router Selection
255.255.255.248

49. What is the IPv4 Protocol number for TCP?
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
6
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
RFC 1918

50. What is prefix /25 in decimal notation?
Sequence Numbers
0x0800
255.255.255.128
RIRs