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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 added after the option field in the 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);
Used by a host to obtain the IP address associated with another host's MAC address
Address Resolution Protocol
Padding of zeros to ensure that the header ends on a 32-bit boundary

2. What is the format of the ToS byte in the IPv4 header?
Urgent
6
IP Precedence (3-bit); ToS (4-bit); Reserved (1-bit)
Router#clear arp-cache [{interface {interface}} | {ip-address}]

3. What is the the MF-bit in the IPv4 header?
1
RFC 791
More Fragments follow
89

4. What is the IPv4 Protocol number for GRE?
47
Reset
Used by IRDP on some operating systems to discover local routers
Echo

5. How can the receiver determine the size of a packet's data payload based on the IPv4 header?
Subtract Header Length field from Total Length field
RFC 1918
RIPv1 and IGRP
Minimize Delay (1-bit); Maximise Throughput (1-bit); Maximise Reliability (1-bit); Minimize Monetary Cost (1-bit)

6. What is OSI?
Router#clear arp-cache [{interface {interface}} | {ip-address}]
Number of octets to be added to the Sequence Number to indicate the end of the urgent data
Open Systems Interconnection
IANA

7. What TCP/IP protocol suite layer corresponds to the physical and data link layers of the OSI model?
Acknowledgements - checksums and timers
ICANN and IANA
Network interface
1

8. What is the recommended default TTL?
64
1
169.254.0.0/16
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

9. What is prefix /28 in decimal notation?
Data Offset
Used by a host to obtain the IP address associated with another host's MAC address
127.0.0.0/8
255.255.255.240

10. Who administers and registers IP address space and AS numbers within a region?
Internet
RIRs
RFC 3330
17

11. What is the content of the Maximum Segment Size (MSS) in the Option field of the TCP header?
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
Redirect
Largest segment size that the sender is willing to accept
Router#debug arp

12. What is a TCP Acknowledgement Number?
9
Protocols that include subnet masks in their routing updates
Time to Live
The next sequence number that the source expects to receive from the destination

13. What mechanism is used by TCP to regulate the flow of segments?
Padding of zeros to ensure that the header ends on a 32-bit boundary
Acknowledgements - checksums and timers
Open Systems Interconnection
Windowing

14. What is ICMP Type 5?
Redirect
4
URG flag set
4

15. Who assigns IP address space to its own customers?
LIRs
Echo
Internet
Router(config)#ip netmask-format {bit-count | decimal | hexadecimal}

16. What is proxy ARP?
Synchronize
1
Time Exceeded
Method where routers - by responding to ARP requests for IP addresses in different subnets - make themselves available to hosts with no default gateway configured

17. What is the format of a UDP header?
Source Port (16-bit); Destination Port (16-bit); UDP Length (16-bit); Checksum (16-bit)
255.255.255.192
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
IPv4 and IPv6

18. What are the most frequently used options in the IPv4 header?
Loose source routing; Strict source routing; Record route; Timestamp
8
Per-Hop Behaviour (PHB)
255.255.255.128

19. Which IPv4 address range is reserved for loopback testing?
127.0.0.0/8
ICANN and IANA
Data Offset
Internet

20. What is prefix /25 in decimal notation?
IP Precedence (3-bit); ToS (4-bit); Reserved (1-bit)
255.255.255.128
Electrical/Optical - Mechanical - Functional and Procedural
Push

21. 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
Internet Control Message Protocol
Acknowledgement
RIRs

22. What is the ARP Operation value for an Inverse ARP Request?
10.0.0.0/8; 172.16.0.0/12; 192.168.0.0/16
Offset - in units of eight octets - from the beginning of the original header to the beginning of the fragment
LIRs
8

23. What is the first octet rule for IPv4 address classes in decimal?
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
Used by a host to obtain the IP address associated with another host's MAC address
Class A 1-126; Class B 128-191; Class C 192-223; Class D 224-239; Class E 240-254
Router(config-if)#arp timeout {seconds}

24. What is ARP?
Router#clear arp-cache [{interface {interface}} | {ip-address}]
Address Resolution Protocol
Number of octets to be added to the Sequence Number to indicate the end of the urgent data
Echo

25. What is IANA?
Sequence Numbers
Internet Assigned Numbers Authority
169.254.0.0/16
64

26. Specifies the format in which subnet masks are displayed in show command output
ICMP Router Discovery Protocol
Address Resolution Protocol
Router(config)#ip netmask-format {bit-count | decimal | hexadecimal}
Largest segment size that the sender is willing to accept

27. Which IPv4 address range is reserved for link-local addresses when DHCP fails?
Used by a host to obtain the IP address associated with another host's MAC address
20 octets
6
169.254.0.0/16

28. What are the private IPv4 address ranges?
10.0.0.0/8; 172.16.0.0/12; 192.168.0.0/16
Used by a host to obtain the IP address associated with another host's MAC address
198.18.0.0/15
Time Exceeded

29. What is the IPv4 Protocol number for ICMP?
Regional Internet Registry
1
More Fragments follow
Electrical/Optical - Mechanical - Functional and Procedural

30. Adds a permanent static ARP entry for an Ethernet host
Router(config-if)#no ip proxy-arp
47
88
Router(config)#arp {ip-address} {mac-address} arpa

31. What is the format of a TCP header?
Internet Corporation for Assigned Network Numbers
Router#show arp
Synchronize
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

32. Disables the sending 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
Class A 0; Class B 10; Class C 110; Class D 1110; Class E 1111
Protocols that don't include subnet masks in their routing updates
Router(config-if)#no ip redirects

33. What is a TCP port number of an application called when it is coupled with the IP address of the server?
Socket
They are the same byte - but the names and value interpretations are different
Congestion Window Reduced
NIRs

34. What is ECE?
Internet
IANA
ECN-Echo
Echo Reply

35. What are classful routing protocols?

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36. What TCP/IP protocol suite layer corresponds to the transport layer of the OSI model?
Per-Hop Behaviour (PHB)
RFC 791
RIRs
Host-to-host

37. What is the purpose of a socket?
3
Uniquely identify every application in the network
Push
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

38. Why must the header checksum of an IPv4 packet be recalculated at every router?
Each router decrements the TTL
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
3
255.255.255.252

39. What is the ARP Operation value for an ARP Reply?
IANA
Both the TCP header and the encapsulated data
2
Sequence Numbers

40. What is PSH?
Push
RFC 3330
Open Systems Interconnection
Used by IRDP on some operating systems to discover local routers

41. What is the IPv4 Protocol number for TCP?
RIPv1 and IGRP
Uniquely identify every application in the network
Echo
6

42. What TCP/IP protocol suite layer corresponds to the session - presentation and application layers of the OSI model?
Router(config-if)#arp timeout {seconds}
Application
Used by routers to notify hosts of another router on the data link that should be used for a particular destination
Sequence Numbers

43. What is the IPv4 protocol number for UDP?
Sequence Numbers
2
17
Used by a host to obtain the IP address associated with another host's MAC address

44. What is prefix /27 in decimal notation?
255.255.255.224
IANA
Sequence Number
10.0.0.0/8; 172.16.0.0/12; 192.168.0.0/16

45. What is SYN?
Router Advertisement
Synchronize
0 Routine; 1 Priority; 2 Immediate; 3 Flash; 4 Flash Override; 5 Critical; 6 Internetwork Control; 7 Network Control
Don't Fragment

46. What TCP/IP protocol suite layer corresponds to the network layer of the OSI model?
IANA
Internet
Application
Time to Live

47. What is LIR?
Local Internet Registry
2
Urgent
ICANN

48. What is the difference between the ToS and the DiffServ byte?
URG flag set
89
RIRs
They are the same byte - but the names and value interpretations are different

49. What is the other name for the TCP Header Length field?
Data Offset
Echo Reply
17
All Internet Registries

50. What is the IPv4 Protocol number for IP in IP encapsulation?
Router(config)#ip arp proxy disable
Both the TCP header and the encapsulated data
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
4