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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 most commonly used Option field in the TCP header?
9
Each router decrements the TTL
192.88.99.0/24
Maximum Segment Size (MSS)

2. What is the format of the DiffServ byte?
IP Precedence (3-bit); ToS (4-bit); Reserved (1-bit)
4
Internet Corporation for Assigned Network Numbers
DSCP (6-bit); ECN (2-bit)

3. What is the recommended default TTL?
64
Push
Redirect
RIRs

4. What TCP/IP protocol suite layer corresponds to the network layer of the OSI model?
0 Routine; 1 Priority; 2 Immediate; 3 Flash; 4 Flash Override; 5 Critical; 6 Internetwork Control; 7 Network Control
6
Router Advertisement
Internet

5. Who can assign IP address space to end user organizations?
All Internet Registries
1
ICANN
Padding of zeros to ensure that the header ends on a 32-bit boundary

6. What is ARP?
1
Sequence Numbers
Address Resolution Protocol
Application

7. What is the format of the Flags field in the IPv4 header?
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
CWR (1-bit); ECE (1-bit); URG (1-bit); ACK (1-bit); PSH (1-bit); RST (1-bit); SYN (1-bit); FIN (1-bit)
Reserved (1-bit); DF (1-bit); MF (1-bit)
Subtract Header Length field from Total Length field

8. What TCP/IP protocol suite layer corresponds to the transport layer of the OSI model?
Host-to-host
IANA
Router(config-if)#no ip proxy-arp
Minimize Delay (1-bit); Maximise Throughput (1-bit); Maximise Reliability (1-bit); Minimize Monetary Cost (1-bit)

9. What is the IPv4 protocol number for UDP?
17
1
255.255.255.252
RFC 791

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

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11. What are the private IPv4 address ranges?
RFC 3330
Data Offset
Largest segment size that the sender is willing to accept
10.0.0.0/8; 172.16.0.0/12; 192.168.0.0/16

12. What is the ARP Operation value for an ARP Reply?
2
192.88.99.0/24
Protocols that don't include subnet masks in their routing updates
Router(config-if)#no ip redirects

13. Who owns the processes by which public IP address space and AS numbers are allocated and assigned?
Windowing
Sequence Number + Data payload octets + 1
Internet Service Provider
ICANN

14. What is the difference between the ToS and the DiffServ byte?
Subtract Header Length field from Total Length field
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
They are the same byte - but the names and value interpretations are different
Final

15. What is the format of the TCP Header Length field?
IANA
Redirect
Method where routers - by responding to ARP requests for IP addresses in different subnets - make themselves available to hosts with no default gateway configured
Length of header in words (32-bit)

16. Who administers and registers public IP address space and AS numbers within a country or economic unit?
Network interface
Local Internet Registry
Internet Control Message Protocol
NIRs

17. Who allocates IP address space and AS numbers to RIRs?
ICMP Router Discovery Protocol
17
1
IANA

18. What is the IPv4 Protocol number for EIGRP?
RFC 1918
88
Class A 0; Class B 10; Class C 110; Class D 1110; Class E 1111
Final

19. Configures how long a dynamically learned protocol address and its corresponding hardware address remains in the ARP cache
Router(config-if)#arp timeout {seconds}
Congestion Window Reduced
255.255.255.192
ICANN and IANA

20. What is Inverse ARP?

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21. What mechanism is used by TCP to provided ordered segment delivery?
The next sequence number that the source expects to receive from the destination
Sequence Numbers
National Internet Registry
0x0800

22. What is covered by the TCP Checksum field?
Both the TCP header and the encapsulated data
Internet Protocol
RFC 1918
Redirect

23. What is prefix /28 in decimal notation?
9
255.255.255.240
Windowing
ICANN

24. What is added after the Option field in the TCP header?
Offset - in units of eight octets - from the beginning of the original header to the beginning of the fragment
Padding of zeros to ensure that the header ends on a 32-bit boundary
Number of octets to be added to the Sequence Number to indicate the end of the urgent data
Internet Assigned Numbers Authority

25. What is IANA?
Internet Service Provider
Sequence Number + Data payload octets + 1
Time Exceeded
Internet Assigned Numbers Authority

26. What is URG?
Urgent
Acknowledgement
ICMP Router Discovery Protocol
192.88.99.0/24

27. What is the function of ICMP router advertisement and router selection messages?
Used by IRDP on some operating systems to discover local routers
1
Used by a host to obtain the IPv4 address associated with its own MAC address
Router(config)#ip netmask-format {bit-count | decimal | hexadecimal}

28. What are classful routing protocols?

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29. What is prefix /26 in decimal notation?
IPv4 and IPv6
3
255.255.255.192
Acknowledgements - checksums and timers

30. What TCP/IP protocol suite layer corresponds to the session - presentation and application layers of the OSI model?
Router Selection
Urgent
Application
255.255.255.248

31. What is the the MF-bit in the IPv4 header?
More Fragments follow
Windowing
0x0800
CWR (1-bit); ECE (1-bit); URG (1-bit); ACK (1-bit); PSH (1-bit); RST (1-bit); SYN (1-bit); FIN (1-bit)

32. What routing protocols are classful?
DSCP (6-bit); ECN (2-bit)
RIPv1 and IGRP
169.254.0.0/16
Destination Unreachable

33. What is the ARP Operation value for a Reverse ARP Request?
Maximum Segment Size (MSS)
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
Used by IRDP on some operating systems to discover local routers
3

34. What is the value of the TCP Reserved field?
0
All Internet Registries
Electrical/Optical - Mechanical - Functional and Procedural
URG flag set

35. Who assigns IP address space to its own customers?
255.255.255.252
Echo Reply
DHCP
LIRs

36. What is RST?
64
RFC 1918
Reset
Largest segment size that the sender is willing to accept

37. What is OSI?
Acknowledgements - checksums and timers
Open Systems Interconnection
LIRs
Per-Hop Behaviour (PHB)

38. What is ICMP Type 10?
Router(config)#ip netmask-format {bit-count | decimal | hexadecimal}
Regional Internet Registry
17
Router Selection

39. What is SYN?
8
URG flag set
IANA
Synchronize

40. What field identifies where the TCP encapsulated data fits within the data stream from the sender?
255.255.255.224
Router#show arp
Sequence Number
RFC 1918

41. What is the purpose of a socket?
Router(config)#ip netmask-format {bit-count | decimal | hexadecimal}
Router Selection
Reserved (1-bit); DF (1-bit); MF (1-bit)
Uniquely identify every application in the network

42. What mechanism is used by TCP to regulate the flow of segments?
Windowing
Loose source routing; Strict source routing; Record route; Timestamp
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)

43. Who group public IPv4 address space by major geographic region?
0
ICANN and IANA
Host-to-host
Router(config-if)#no ip redirects

44. What are the IP Precedence values?
1
Reserved (1-bit); DF (1-bit); MF (1-bit)
Subtract Header Length field from Total Length field
0 Routine; 1 Priority; 2 Immediate; 3 Flash; 4 Flash Override; 5 Critical; 6 Internetwork Control; 7 Network Control

45. What are the most frequently used options in the IPv4 header?
Local Internet Registry
Final
Loose source routing; Strict source routing; Record route; Timestamp
Time to Live

46. What is ICMP Type 5?
Echo Reply
Router(config)#ip arp proxy disable
3
Redirect

47. Which IPv4 address range is reserved for benchmark testing of Internet devices (RFC 2544)?
198.18.0.0/15
All Internet Registries
1
8

48. What is prefix /27 in decimal notation?
1
4
255.255.255.224
10.0.0.0/8; 172.16.0.0/12; 192.168.0.0/16

49. What are classless routing protocols?
17
Protocols that include subnet masks in their routing updates
Each router decrements the TTL
Open Systems Interconnection

50. What is LIR?
Local Internet Registry
Electrical/Optical - Mechanical - Functional and Procedural
Internet Control Message Protocol
6