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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. What is SYN?
More Fragments follow
Electrical/Optical - Mechanical - Functional and Procedural
192.88.99.0/24
Synchronize

2. Which IPv4 address range is reserved for use in documentation and example code?
192.0.2.0/24
3
0
47

3. What is ICMP Type 9?
Network interface
3
Router Advertisement
Internet Control Message Protocol

4. What is the function of ICMP redirect messages?
Router#debug arp
Used by routers to notify hosts of another router on the data link that should be used for a particular destination
Router#clear arp-cache [{interface {interface}} | {ip-address}]
Loose source routing; Strict source routing; Record route; Timestamp

5. What is the IPv4 Protocol number for GRE?
47
Local Internet Registry
255.255.255.224
Both the TCP header and the encapsulated data

6. What is the IPv4 Protocol number for TCP?
6
Push
Redirect
255.255.255.252

7. What is a TCP port number of an application called when it is coupled with the IP address of the server?
Used by IRDP on some operating systems to discover local routers
1
Socket
IP Precedence (3-bit); ToS (4-bit); Reserved (1-bit)

8. What is the ARP Operation value for an Inverse ARP Request?
Internet Protocol
8
Internet Corporation for Assigned Network Numbers
Internet Service Provider

9. What is the content of the the Urgent Pointer field in the TCP header?
ECN-Echo
Number of octets to be added to the Sequence Number to indicate the end of the urgent data
National Internet Registry
The next sequence number that the source expects to receive from the destination

10. What is covered by the TCP Checksum field?
Acknowledgements - checksums and timers
Subtract Header Length field from Total Length field
Both the TCP header and the encapsulated data
Destination Unreachable

11. What is the first octet rule for IPv4 address classes in binary?
Used by a host to obtain the IP address associated with another host's MAC address
Class A 0; Class B 10; Class C 110; Class D 1110; Class E 1111
Used by a host to obtain the IPv4 address associated with its own MAC address
192.88.99.0/24

12. Which RFC defines IPv4?
DSCP (6-bit); ECN (2-bit)
All Internet Registries
RFC 791
255.255.255.128

13. What is Reverse ARP?
20 octets
Used by a host to obtain the IPv4 address associated with its own MAC address
4
Router#show arp

14. What is gratuitous ARP?
4
RIRs
An ARP request issued by a host with its own IPv4 address as the target address
Largest segment size that the sender is willing to accept

15. What TCP/IP protocol suite layer corresponds to the transport layer of the OSI model?
Host-to-host
Class A 1-126; Class B 128-191; Class C 192-223; Class D 224-239; Class E 240-254
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);
Sequence Numbers

16. What is the ARP Operation value for an ARP Reply?
RFC 1918
192.88.99.0/24
2
Source Port (16-bit); Destination Port (16-bit); UDP Length (16-bit); Checksum (16-bit)

17. Who are LIRs?
169.254.0.0/16
Mostly large ISPs - enterprises - or academic institutions
Used by a host to obtain the IP address associated with another host's MAC address
IANA

18. What TCP/IP protocol suite layer corresponds to the network layer of the OSI model?
Don't Fragment
Internet
46
Socket

19. What is the TTL field 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
Router Advertisement
Internet Assigned Numbers Authority
Time to Live

20. What is the format of a UDP header?
RFC 1918
Source Port (16-bit); Destination Port (16-bit); UDP Length (16-bit); Checksum (16-bit)
169.254.0.0/16
Time Exceeded

21. What is the ARP Hardware type value for Ethernet?
IANA
DSCP (6-bit); ECN (2-bit)
RIPv1 and IGRP
1

22. What are the steps to subnet an IPv4 address?
Duplicate address checks; Advertise new data-link identifiers; Update the ARP caches of hosts
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
ICMP Router Discovery Protocol
They are the same byte - but the names and value interpretations are different

23. What are the most common IP version numbers?
NIRs
Data Offset
IANA
IPv4 and IPv6

24. What is IANA?
Router(config-if)#no ip proxy-arp
Internet Assigned Numbers Authority
Sequence Numbers
Electrical/Optical - Mechanical - Functional and Procedural

25. What is the first octet rule for IPv4 address classes in decimal?
Uniquely identify every application in the network
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
2
Class A 1-126; Class B 128-191; Class C 192-223; Class D 224-239; Class E 240-254

26. What is the IPv4 Protocol number for OSPF?
Used by a host to obtain the IPv4 address associated with its own MAC address
89
Router#clear arp-cache [{interface {interface}} | {ip-address}]
0x0800

27. What TCP/IP protocol suite layer corresponds to the physical and data link layers of the OSI model?
17
Internet Control Message Protocol
Network interface
Offset - in units of eight octets - from the beginning of the original header to the beginning of the fragment

28. What is the format of the ToS field?
Protocols that include subnet masks in their routing updates
Minimize Delay (1-bit); Maximise Throughput (1-bit); Maximise Reliability (1-bit); Minimize Monetary Cost (1-bit)
Router(config)#arp {ip-address} {mac-address} arpa
Don't Fragment

29. What TCP/IP protocol suite layer corresponds to the session - presentation and application layers of the OSI model?
10.0.0.0/8; 172.16.0.0/12; 192.168.0.0/16
Maximum Segment Size (MSS)
Application
Duplicate address checks; Advertise new data-link identifiers; Update the ARP caches of hosts

30. How can the receiver determine the size of a packet's data payload based on the IPv4 header?
60 octets
Number of octets to be added to the Sequence Number to indicate the end of the urgent data
10.0.0.0/8; 172.16.0.0/12; 192.168.0.0/16
Subtract Header Length field from Total Length field

31. Which IPv4 address range is reserved for IPv6 to IPv4 (6to4) relays (RFC 3068)?
192.88.99.0/24
Used by IRDP on some operating systems to discover local routers
LIRs
0x0800

32. What is FIN?
Final
Router#clear arp-cache [{interface {interface}} | {ip-address}]
0x0800
Used by routers to notify hosts of another router on the data link that should be used for a particular destination

33. Why must the header checksum of an IPv4 packet be recalculated at every router?
Each router decrements the TTL
Source Port (16-bit); Destination Port (16-bit); UDP Length (16-bit); Checksum (16-bit)
Address Resolution Protocol
Offset - in units of eight octets - from the beginning of the original header to the beginning of the fragment

34. Disables the sending of ICMP redirect messages
Loose source routing; Strict source routing; Record route; Timestamp
CWR (1-bit); ECE (1-bit); URG (1-bit); ACK (1-bit); PSH (1-bit); RST (1-bit); SYN (1-bit); FIN (1-bit)
Router(config-if)#no ip redirects
Router(config-if)#arp timeout {seconds}

35. What is the format of the Flags field in the IPv4 header?
2
IANA
Reserved (1-bit); DF (1-bit); MF (1-bit)
0

36. Specifies the format in which subnet masks are displayed in show command output
Router(config)#ip netmask-format {bit-count | decimal | hexadecimal}
1
An ARP request issued by a host with its own IPv4 address as the target address
Router#show arp

37. What is CWR?
Router(config)#ip arp proxy disable
Reset
Router#clear arp-cache [{interface {interface}} | {ip-address}]
Congestion Window Reduced

38. What is ICMP Type 3?
LIRs
Destination Unreachable
Number of octets to be added to the Sequence Number to indicate the end of the urgent data
Both the TCP header and the encapsulated data

39. What is prefix /26 in decimal notation?
Internet Control Message Protocol
255.255.255.192
ICMP Router Discovery Protocol
URG flag set

40. What is the ARP Operation value for a Reverse ARP Request?
47
3
Per-Hop Behaviour (PHB)
10.0.0.0/8; 172.16.0.0/12; 192.168.0.0/16

41. What are the uses of gratuitous ARP?
Router#show arp
Application
Duplicate address checks; Advertise new data-link identifiers; Update the ARP caches of hosts
DSCP (6-bit); ECN (2-bit)

42. What is ICMP Type 10?
1
169.254.0.0/16
Router Selection
Router(config)#ip arp proxy disable

43. Who administers and registers public IP address space and AS numbers within a country or economic unit?
NIRs
Class A 0; Class B 10; Class C 110; Class D 1110; Class E 1111
Largest segment size that the sender is willing to accept
Router(config)#arp {ip-address} {mac-address} arpa

44. Who allocates public IP address ranges to NIRs or LIRs?
Router#show arp
Maximum Segment Size (MSS)
RIRs
192.0.2.0/24

45. What is the other name for the TCP Header Length field?
2
255.255.255.248
Identifier; Flags and Fragmentation Offset
Data Offset

46. What is ACK?
Loose source routing; Strict source routing; Record route; Timestamp
Acknowledgement
9
Used by routers to notify hosts of another router on the data link that should be used for a particular destination

47. What is a TCP Acknowledgement Number?
URG flag set
The next sequence number that the source expects to receive from the destination
Router Selection
RFC 3330

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

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49. What is the content of the Maximum Segment Size (MSS) in the Option field of the TCP header?
Largest segment size that the sender is willing to accept
DSCP (6-bit); ECN (2-bit)
Address Resolution Protocol
Source Port (16-bit); Destination Port (16-bit); UDP Length (16-bit); Checksum (16-bit)

50. What is the ARP Operation value for an Inverse ARP Reply?
Each router decrements the TTL
Padding of zeros to ensure that the header ends on a 32-bit boundary
9
Both the TCP header and the encapsulated data