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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 content of the TCP Window Size field?
Loose source routing; Strict source routing; Record route; Timestamp
Maximum Segment Size (MSS)
2
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

2. What is added after the option field in the IPv4 header?
NIRs
Internet Protocol
Router(config-if)#no ip proxy-arp
Padding of zeros to ensure that the header ends on a 32-bit boundary

3. Adds a permanent static ARP entry for an Ethernet host
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
Router(config)#arp {ip-address} {mac-address} arpa
Electrical/Optical - Mechanical - Functional and Procedural
Router#show arp

4. What are the IP Precedence values?
0 Routine; 1 Priority; 2 Immediate; 3 Flash; 4 Flash Override; 5 Critical; 6 Internetwork Control; 7 Network Control
2
20 octets
46

5. What is PSH?
Network interface
198.18.0.0/15
Push
Open Systems Interconnection

6. What is the format of the TCP Header Length field?
Minimize Delay (1-bit); Maximise Throughput (1-bit); Maximise Reliability (1-bit); Minimize Monetary Cost (1-bit)
Length of header in words (32-bit)
The next sequence number that the source expects to receive from the destination
RFC 1918

7. What is prefix /27 in decimal notation?
Per-Hop Behaviour (PHB)
255.255.255.224
RFC 791
More Fragments follow

8. What is ICMP Type 3?
0 Routine; 1 Priority; 2 Immediate; 3 Flash; 4 Flash Override; 5 Critical; 6 Internetwork Control; 7 Network Control
4
Destination Unreachable
Used by a host to obtain the IPv4 address associated with its own MAC address

9. Disables the sending of ICMP redirect messages
20 octets
Router(config-if)#no ip redirects
They are the same byte - but the names and value interpretations are different
Socket

10. Which IPv4 address range is reserved for IPv6 to IPv4 (6to4) relays (RFC 3068)?
They are the same byte - but the names and value interpretations are different
47
Final
192.88.99.0/24

11. What is prefix /25 in decimal notation?
255.255.255.128
Router(config)#arp {ip-address} {mac-address} arpa
Internet Service Provider
CWR (1-bit); ECE (1-bit); URG (1-bit); ACK (1-bit); PSH (1-bit); RST (1-bit); SYN (1-bit); FIN (1-bit)

12. What is OSI?
RFC 1918
Open Systems Interconnection
Router(config-if)#arp timeout {seconds}
Sequence Numbers

13. What TCP/IP protocol suite layer corresponds to the session - presentation and application layers of the OSI model?
Used by a host to obtain the IPv4 address associated with its own MAC address
Application
Electrical/Optical - Mechanical - Functional and Procedural
1

14. What is the IPv4 Protocol number for GRE?
Used by a host to obtain the IP address associated with another host's MAC address
IP Precedence (3-bit); ToS (4-bit); Reserved (1-bit)
47
They are the same byte - but the names and value interpretations are different

15. What is ICMP Type 11?
1
Router Selection
9
Time Exceeded

16. What is the the MF-bit in the IPv4 header?
IANA
Application
More Fragments follow
Network interface

17. 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
Open Systems Interconnection
255.255.255.252
192.0.2.0/24

18. What is ICMP Type 10?
Router Selection
0x0800
Used by routers to notify hosts of another router on the data link that should be used for a particular destination
Socket

19. What are the most frequently used options in the IPv4 header?
60 octets
Internet Corporation for Assigned Network Numbers
Loose source routing; Strict source routing; Record route; Timestamp
Local Internet Registry

20. What is the format of an ARP packet?
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
Padding of zeros to ensure that the header ends on a 32-bit boundary
An ARP request issued by a host with its own IPv4 address as the target address
Internet Corporation for Assigned Network Numbers

21. What is the format of the ToS byte in the IPv4 header?
Acknowledgements - checksums and timers
169.254.0.0/16
IANA
IP Precedence (3-bit); ToS (4-bit); Reserved (1-bit)

22. 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
RIRs
Address Resolution Protocol
255.255.255.128

23. What is the format of a TCP header?
Padding of zeros to ensure that the header ends on a 32-bit boundary
Acknowledgements - checksums and timers
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
Type (8-bit); Code (8-bit); Checksum (16-bit); Variable fields

24. What is proxy ARP?
4
Method where routers - by responding to ARP requests for IP addresses in different subnets - make themselves available to hosts with no default gateway configured
Loose source routing; Strict source routing; Record route; Timestamp
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

25. What is the ARP Operation value for an ARP Reply?
Padding of zeros to ensure that the header ends on a 32-bit boundary
Router(config)#arp {ip-address} {mac-address} arpa
2
URG flag set

26. What is RST?
4
Reset
DHCP
255.255.255.252

27. What is the name of the queuing and forwarding of IP packets based on DiffServ?
ECN-Echo
Padding of zeros to ensure that the header ends on a 32-bit boundary
Per-Hop Behaviour (PHB)
1

28. Which RFC defines the private IPv4 address ranges?
RFC 1918
They are the same byte - but the names and value interpretations are different
3
Number of octets to be added to the Sequence Number to indicate the end of the urgent data

29. What are classful routing protocols?

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30. What is the function of ICMP router advertisement and router selection messages?
1
Used by IRDP on some operating systems to discover local routers
Sequence Numbers
Protocols that don't include subnet masks in their routing updates

31. What is prefix /29 in decimal notation?
RIRs
Identifier; Flags and Fragmentation Offset
Local Internet Registry
255.255.255.248

32. Who allocates IP address space and AS numbers to RIRs?
Acknowledgement
IANA
Internet Control Message Protocol
Local Internet Registry

33. Which IPv4 address range is reserved for benchmark testing of Internet devices (RFC 2544)?
DSCP (6-bit); ECN (2-bit)
198.18.0.0/15
Source Port (16-bit); Destination Port (16-bit); UDP Length (16-bit); Checksum (16-bit)
Offset - in units of eight octets - from the beginning of the original header to the beginning of the fragment

34. What mechanism is used by TCP to provided ordered segment delivery?
1
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
IANA
Sequence Numbers

35. What is the maximum length of an IPv4 header?
60 octets
6
ICANN and IANA
255.255.255.128

36. 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
Router#clear arp-cache [{interface {interface}} | {ip-address}]
LIRs
4

37. What is RIR?
All Internet Registries
Regional Internet Registry
Router#clear arp-cache [{interface {interface}} | {ip-address}]
60 octets

38. What is the formula to calculate the next Sequence Number based on the Sequence Number of the current TCP segment?
10.0.0.0/8; 172.16.0.0/12; 192.168.0.0/16
DSCP (6-bit); ECN (2-bit)
127.0.0.0/8
Sequence Number + Data payload octets + 1

39. Who assigns IP address space to its own customers?
Padding of zeros to ensure that the header ends on a 32-bit boundary
89
LIRs
Open Systems Interconnection

40. What is FIN?
255.255.255.128
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
Reset
Final

41. What is ICMP?
Protocols that include subnet masks in their routing updates
Internet Control Message Protocol
255.255.255.224
Time Exceeded

42. What TCP/IP protocol suite layer corresponds to the network layer of the OSI model?
RIPv1 and IGRP
255.255.255.240
88
Internet

43. What is IP?
Internet Protocol
Router(config-if)#arp timeout {seconds}
Reset
Socket

44. Disables proxy ARP on an interface
6
Uniquely identify every application in the network
Router(config-if)#no ip proxy-arp
ECN-Echo

45. What is covered by the TCP Checksum field?
Both the TCP header and the encapsulated data
255.255.255.128
88
Transmission Control Protocol

46. What is the format of an ICMP header?
Type (8-bit); Code (8-bit); Checksum (16-bit); Variable fields
Router(config)#ip arp proxy disable
DHCP
1-2 Network interface; 3 Internet; 4 Host-to-host; 5-7 Application

47. Who can assign IP address space to end user organizations?
0 Routine; 1 Priority; 2 Immediate; 3 Flash; 4 Flash Override; 5 Critical; 6 Internetwork Control; 7 Network Control
Router#show arp
RFC 3330
All Internet Registries

48. What is the prerequisite for using the Urgent Pointer field in the TCP header?
Congestion Window Reduced
URG flag set
Protocols that don't include subnet masks in their routing updates
Local Internet Registry

49. Who allocates public IP address ranges to NIRs or LIRs?
Per-Hop Behaviour (PHB)
Open Systems Interconnection
192.88.99.0/24
RIRs

50. What is the value of the TCP Reserved field?
Internet
Time Exceeded
Internet Service Provider
0