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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 ICMP?
Internet Control Message Protocol
Router#show arp
ICANN and IANA
0

2. What is the recommended default TTL?
LIRs
Subtract Header Length field from Total Length field
64
20 octets

3. What is prefix /30 in decimal notation?
3
255.255.255.252
LIRs
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

4. What is the formula to calculate the next Sequence Number based on the Sequence Number of the current TCP segment?
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
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
Protocols that include subnet masks in their routing updates
Sequence Number + Data payload octets + 1

5. What mechanism is used by TCP to provided ordered segment delivery?
Sequence Numbers
8
6
10.0.0.0/8; 172.16.0.0/12; 192.168.0.0/16

6. What is SYN?
46
Synchronize
Local Internet Registry
255.255.255.192

7. Which RFC defines the private IPv4 address ranges?
Subtract Header Length field from Total Length field
Used by routers to notify hosts of another router on the data link that should be used for a particular destination
RFC 1918
Data Offset

8. What is the IPv4 Protocol number of RSVP?
Synchronize
Used by a host to obtain the IP address associated with another host's MAC address
2
46

9. Disables the sending of ICMP redirect messages
Synchronize
Router(config-if)#no ip redirects
3
Internet

10. Specifies the format in which subnet masks are displayed in show command output
Type (8-bit); Code (8-bit); Checksum (16-bit); Variable fields
Router(config)#ip netmask-format {bit-count | decimal | hexadecimal}
Duplicate address checks; Advertise new data-link identifiers; Update the ARP caches of hosts
Sequence Numbers

11. What is ICMP Type 9?
Length of header in words (32-bit)
Internet Service Provider
1
Router Advertisement

12. What is the function of ICMP redirect messages?
Redirect
Identifier; Flags and Fragmentation Offset
9
Used by routers to notify hosts of another router on the data link that should be used for a particular destination

13. Who administers and registers public IP address space and AS numbers within a country or economic unit?
Mostly large ISPs - enterprises - or academic institutions
NIRs
Sequence Number + Data payload octets + 1
Subtract Header Length field from Total Length field

14. Who owns the processes by which public IP address space and AS numbers are allocated and assigned?
ICANN
Echo
Subtract Header Length field from Total Length field
47

15. Who is responsible for maintaining the official assignments of TCP and UDP port numbers for specific uses?
Router Selection
6
All Internet Registries
IANA

16. What is the ARP Operation value for an Inverse ARP Reply?
9
255.255.255.192
Push
20 octets

17. Which RFC defines the special use IPv4 address ranges?
RFC 3330
6
Time Exceeded
Host-to-host

18. What are the protocol categories that describe the physical layer?
IANA
Electrical/Optical - Mechanical - Functional and Procedural
Time Exceeded
2

19. What is the format of the ToS field?
9
Data Offset
Sequence Number + Data payload octets + 1
Minimize Delay (1-bit); Maximise Throughput (1-bit); Maximise Reliability (1-bit); Minimize Monetary Cost (1-bit)

20. What is added after the Option field in the TCP header?
192.88.99.0/24
Largest segment size that the sender is willing to accept
Padding of zeros to ensure that the header ends on a 32-bit boundary
Push

21. What is IRDP?
IANA
89
ICMP Router Discovery Protocol
Both the TCP header and the encapsulated data

22. Which RFC defines IPv4?
169.254.0.0/16
RFC 791
Offset - in units of eight octets - from the beginning of the original header to the beginning of the fragment
255.255.255.252

23. What is the IPv4 protocol number for UDP?
17
Source Port (16-bit); Destination Port (16-bit); UDP Length (16-bit); Checksum (16-bit)
Padding of zeros to ensure that the header ends on a 32-bit boundary
255.255.255.128

24. Adds a permanent static ARP entry for an Ethernet host
1
Router(config)#arp {ip-address} {mac-address} arpa
CWR (1-bit); ECE (1-bit); URG (1-bit); ACK (1-bit); PSH (1-bit); RST (1-bit); SYN (1-bit); FIN (1-bit)
192.0.2.0/24

25. What is the ARP Operation value for an ARP Reply?
Network interface
Used by a host to obtain the IPv4 address associated with its own MAC address
ICANN and IANA
2

26. What TCP/IP protocol suite layer corresponds to the physical and data link layers of the OSI model?
Network interface
IP Precedence (3-bit); ToS (4-bit); Reserved (1-bit)
Address Resolution Protocol
Data Offset

27. What is OSI?
2
Router(config)#arp {ip-address} {mac-address} arpa
Open Systems Interconnection
4

28. Enables debugging output for ARP transactions
255.255.255.128
Largest segment size that the sender is willing to accept
Windowing
Router#debug arp

29. What are the most frequently used options in the IPv4 header?
Loose source routing; Strict source routing; Record route; Timestamp
Don't Fragment
Reserved (1-bit); DF (1-bit); MF (1-bit)
Length of header in words (32-bit)

30. What is a TCP Acknowledgement Number?
The next sequence number that the source expects to receive from the destination
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);
88
Each router decrements the TTL

31. What is covered by the TCP Checksum field?
DHCP
2
Both the TCP header and the encapsulated data
Length of header in words (32-bit)

32. What is ICMP Type 11?
Per-Hop Behaviour (PHB)
Router#clear arp-cache [{interface {interface}} | {ip-address}]
Padding of zeros to ensure that the header ends on a 32-bit boundary
Time Exceeded

33. Who are LIRs?
IANA
Router(config-if)#no ip proxy-arp
Router Selection
Mostly large ISPs - enterprises - or academic institutions

34. What is the format of the ToS byte in the IPv4 header?
The next sequence number that the source expects to receive from the destination
Destination Unreachable
Router#show arp
IP Precedence (3-bit); ToS (4-bit); Reserved (1-bit)

35. What is IP?
2
255.255.255.240
Internet Protocol
255.255.255.192

36. Who assigns IP address space to its own customers?
CWR (1-bit); ECE (1-bit); URG (1-bit); ACK (1-bit); PSH (1-bit); RST (1-bit); SYN (1-bit); FIN (1-bit)
Method where routers - by responding to ARP requests for IP addresses in different subnets - make themselves available to hosts with no default gateway configured
LIRs
Time Exceeded

37. What is the ARP Operation value for a Reverse ARP Request?
4
They are the same byte - but the names and value interpretations are different
Echo
3

38. What is the most commonly used Option field in the TCP header?
198.18.0.0/15
Padding of zeros to ensure that the header ends on a 32-bit boundary
Maximum Segment Size (MSS)
Method where routers - by responding to ARP requests for IP addresses in different subnets - make themselves available to hosts with no default gateway configured

39. What is the maximum length of an IPv4 header?
60 octets
4
Internet Corporation for Assigned Network Numbers
Protocols that don't include subnet masks in their routing updates

40. What is the content of the the Urgent Pointer field in the TCP header?
60 octets
Number of octets to be added to the Sequence Number to indicate the end of the urgent data
Data Offset
Congestion Window Reduced

41. What is the format of an IPv4 header?
6
RIRs
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);

42. What are classful routing protocols?

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43. What field identifies where the TCP encapsulated data fits within the data stream from the sender?
Sequence Number
Don't Fragment
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
8

44. What is prefix /28 in decimal notation?
4
255.255.255.240
Class A 1-126; Class B 128-191; Class C 192-223; Class D 224-239; Class E 240-254
RFC 1918

45. What is prefix /27 in decimal notation?
Subtract Header Length field from Total Length field
Data Offset
255.255.255.224
255.255.255.248

46. What is the minimum length of an IPv4 header?
Protocols that don't include subnet masks in their routing updates
20 octets
Echo Reply
The next sequence number that the source expects to receive from the destination

47. Which IPv4 address range is reserved for benchmark testing of Internet devices (RFC 2544)?
Acknowledgements - checksums and timers
Transmission Control Protocol
Router#show arp
198.18.0.0/15

48. Disables proxy ARP on an interface
RIPv1 and IGRP
Synchronize
Router(config-if)#no ip proxy-arp
RIRs

49. What is the IPv4 Protocol number for OSPF?
Echo
RIPv1 and IGRP
89
Reset

50. What is ICMP Type 0?
Echo Reply
IPv4 and IPv6
Both the TCP header and the encapsulated data
URG flag set