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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 TCP/IP protocol suite layer corresponds to the transport layer of the OSI model?
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
17
Host-to-host
National Internet Registry

2. What is the ARP Operation value for an Inverse ARP Request?
8
60 octets
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
ICANN

3. What is TCP?
Router#debug arp
Router#show arp
Transmission Control Protocol
Router#clear arp-cache [{interface {interface}} | {ip-address}]

4. What is the content of the the Urgent Pointer field in the TCP header?
Internet
Number of octets to be added to the Sequence Number to indicate the end of the urgent data
2
0 Routine; 1 Priority; 2 Immediate; 3 Flash; 4 Flash Override; 5 Critical; 6 Internetwork Control; 7 Network Control

5. What is ICMP Type 10?
255.255.255.224
Class A 0; Class B 10; Class C 110; Class D 1110; Class E 1111
ICANN
Router Selection

6. What are the private IPv4 address ranges?
4
10.0.0.0/8; 172.16.0.0/12; 192.168.0.0/16
Acknowledgements - checksums and timers
Router(config)#arp {ip-address} {mac-address} arpa

7. What is the difference between the ToS and the DiffServ byte?
They are the same byte - but the names and value interpretations are different
Identifier; Flags and Fragmentation Offset
Padding of zeros to ensure that the header ends on a 32-bit boundary
10.0.0.0/8; 172.16.0.0/12; 192.168.0.0/16

8. Disables the sending of ICMP redirect messages
Don't Fragment
Router(config-if)#no ip redirects
Router#clear arp-cache [{interface {interface}} | {ip-address}]
Each router decrements the TTL

9. How can the receiver determine the size of a packet's data payload based on the IPv4 header?
Router(config-if)#no ip proxy-arp
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);
4
Subtract Header Length field from Total Length field

10. Who allocates public IP address ranges to NIRs or LIRs?
Network interface
Uniquely identify every application in the network
RIRs
Router#debug arp

11. Who assigns IP address space to its own customers?
Acknowledgement
RIRs
17
LIRs

12. What TCP/IP protocol suite layer corresponds to the physical and data link layers of the OSI model?
Network interface
Protocols that include subnet masks in their routing updates
Acknowledgement
Urgent

13. What is the IPv4 Protocol number for GRE?
Don't Fragment
Final
47
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

14. What is the IPv4 Protocol number for OSPF?
RFC 791
89
1
Internet Assigned Numbers Authority

15. What is the function of ICMP router advertisement and router selection messages?
Used by IRDP on some operating systems to discover local routers
Offset - in units of eight octets - from the beginning of the original header to the beginning of the fragment
The next sequence number that the source expects to receive from the destination
255.255.255.192

16. Who are LIRs?
RIRs
Mostly large ISPs - enterprises - or academic institutions
Protocols that include subnet masks in their routing updates
127.0.0.0/8

17. What is the format of a UDP header?
2
Source Port (16-bit); Destination Port (16-bit); UDP Length (16-bit); Checksum (16-bit)
Local Internet Registry
Sequence Numbers

18. Adds a permanent static ARP entry for an Ethernet host
Push
Router(config)#arp {ip-address} {mac-address} arpa
Per-Hop Behaviour (PHB)
IANA

19. What is the ARP Protocol address length value for IPv4?
Destination Unreachable
4
255.255.255.248
ECN-Echo

20. Which IPv4 address range is reserved for IPv6 to IPv4 (6to4) relays (RFC 3068)?
192.88.99.0/24
Protocols that don't include subnet masks in their routing updates
Internet Protocol
Reserved (1-bit); DF (1-bit); MF (1-bit)

21. What is NIR?
255.255.255.192
Router(config-if)#no ip proxy-arp
National Internet Registry
8

22. What are classful routing protocols?

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23. What is added after the option field in the IPv4 header?
Padding of zeros to ensure that the header ends on a 32-bit boundary
255.255.255.252
Final
Echo Reply

24. What is prefix /30 in decimal notation?
Per-Hop Behaviour (PHB)
Router(config)#arp {ip-address} {mac-address} arpa
Internet Service Provider
255.255.255.252

25. What is the minimum length of an IPv4 header?
Push
Don't Fragment
Mostly large ISPs - enterprises - or academic institutions
20 octets

26. What is the format of a TCP header?
Open Systems Interconnection
Router(config-if)#no ip proxy-arp
Source Port (16-bit); Destination Port (16-bit); UDP Length (16-bit); Checksum (16-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

27. What is CWR?
6
Congestion Window Reduced
Router(config)#ip netmask-format {bit-count | decimal | hexadecimal}
Open Systems Interconnection

28. What is the ARP Operation value for an ARP Reply?
Loose source routing; Strict source routing; Record route; Timestamp
IANA
46
2

29. What mechanism is used by TCP to regulate the flow of segments?
Windowing
1
Open Systems Interconnection
Destination Unreachable

30. What are classless routing protocols?
Protocols that include subnet masks in their routing updates
ECN-Echo
0.0.0.0/8
4

31. What is the format of the Flags field in the IPv4 header?
2
Reserved (1-bit); DF (1-bit); MF (1-bit)
Used by a host to obtain the IPv4 address associated with its own MAC address
ICANN

32. What are the uses of gratuitous ARP?
Sequence Numbers
0
Duplicate address checks; Advertise new data-link identifiers; Update the ARP caches of hosts
The next sequence number that the source expects to receive from the destination

33. What is prefix /27 in decimal notation?
IANA
Final
Network interface
255.255.255.224

34. What is the first octet rule for IPv4 address classes in decimal?
Class A 1-126; Class B 128-191; Class C 192-223; Class D 224-239; Class E 240-254
127.0.0.0/8
Sequence Numbers
Source Port (16-bit); Destination Port (16-bit); UDP Length (16-bit); Checksum (16-bit)

35. What is OSI?
Transmission Control Protocol
Identifier; Flags and Fragmentation Offset
ICANN
Open Systems Interconnection

36. What is prefix /29 in decimal notation?
0 Routine; 1 Priority; 2 Immediate; 3 Flash; 4 Flash Override; 5 Critical; 6 Internetwork Control; 7 Network Control
Reset
IANA
255.255.255.248

37. What is FIN?
Final
Used by a host to obtain the IP address associated with another host's MAC address
Reserved (1-bit); DF (1-bit); MF (1-bit)
Router(config)#arp {ip-address} {mac-address} arpa

38. What is the function of ICMP redirect messages?
Redirect
Protocols that don't include subnet masks in their routing updates
255.255.255.248
Used by routers to notify hosts of another router on the data link that should be used for a particular destination

39. What is a TCP Acknowledgement Number?
Data Offset
Padding of zeros to ensure that the header ends on a 32-bit boundary
The next sequence number that the source expects to receive from the destination
Identifier; Flags and Fragmentation Offset

40. What is the content of the Maximum Segment Size (MSS) in the Option field of the TCP header?
Network interface
Reset
Largest segment size that the sender is willing to accept
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

41. What is LIR?
2
Local Internet Registry
17
Class A 1-126; Class B 128-191; Class C 192-223; Class D 224-239; Class E 240-254

42. What are the most common IP version numbers?
Type (8-bit); Code (8-bit); Checksum (16-bit); Variable fields
IPv4 and IPv6
IANA
Application

43. Which RFC defines the special use IPv4 address ranges?
Internet
RFC 3330
Per-Hop Behaviour (PHB)
Echo

44. Configures how long a dynamically learned protocol address and its corresponding hardware address remains in the ARP cache
All Internet Registries
RFC 1918
Router(config-if)#arp timeout {seconds}
DHCP

45. What is ICMP Type 11?
Protocols that include subnet masks in their routing updates
Identifier; Flags and Fragmentation Offset
ECN-Echo
Time Exceeded

46. What is the purpose of a socket?
DSCP (6-bit); ECN (2-bit)
2
Minimize Delay (1-bit); Maximise Throughput (1-bit); Maximise Reliability (1-bit); Minimize Monetary Cost (1-bit)
Uniquely identify every application in the network

47. Which IPv4 address range is reserved for link-local addresses when DHCP fails?
Echo
Sequence Number
169.254.0.0/16
Subtract Header Length field from Total Length field

48. What is ECE?
17
Time to Live
ECN-Echo
0x0800

49. What is the IPv4 Protocol number for IGMP?
Echo
All Internet Registries
2
Internet Control Message Protocol

50. What is ICANN?
Sequence Number + Data payload octets + 1
ECN-Echo
Internet Corporation for Assigned Network Numbers
Router Selection