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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 mechanisms are used by TCP to provide reliable segment delivery?
Acknowledgements - checksums and timers
Used by routers to notify hosts of another router on the data link that should be used for a particular destination
2
Router(config)#arp {ip-address} {mac-address} arpa

2. What are the most common IP version numbers?
47
IPv4 and IPv6
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);
Router#debug arp

3. What is the format of the ToS byte in the IPv4 header?
IP Precedence (3-bit); ToS (4-bit); Reserved (1-bit)
Final
Loose source routing; Strict source routing; Record route; Timestamp
Congestion Window Reduced

4. Who are LIRs?
Router Selection
169.254.0.0/16
ICMP Router Discovery Protocol
Mostly large ISPs - enterprises - or academic institutions

5. Enables debugging output for ARP transactions
Data Offset
4
Router#show arp
Router#debug arp

6. What is the maximum length of an IPv4 header?
0
255.255.255.248
60 octets
ECN-Echo

7. What is the ARP Operation value for an ARP Request?
IANA
Internet Assigned Numbers Authority
1
ICANN and IANA

8. Who administers and registers public IP address space and AS numbers within a country or economic unit?
NIRs
4
1
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);

9. What is the minimum length of an IPv4 header?
Transmission Control Protocol
89
20 octets
255.255.255.252

10. What is TCP?
Per-Hop Behaviour (PHB)
Regional Internet Registry
Transmission Control Protocol
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

11. What mechanism is used by TCP to regulate the flow of segments?
Windowing
Subtract Header Length field from Total Length field
Internet Protocol
Destination Unreachable

12. What is the ARP Operation value for an ARP Reply?
255.255.255.252
2
9
Padding of zeros to ensure that the header ends on a 32-bit boundary

13. What is ISP?
Internet Service Provider
64
1
National Internet Registry

14. Who assigns IP address space to its own customers?
88
Router(config-if)#no ip redirects
89
LIRs

15. What is the ARP Protocol type value for IPv4?
DHCP
Protocols that don't include subnet masks in their routing updates
0x0800
198.18.0.0/15

16. What is the format of the Flags field in the IPv4 header?
RFC 791
Reserved (1-bit); DF (1-bit); MF (1-bit)
Router(config)#arp {ip-address} {mac-address} arpa
RFC 1918

17. Who is responsible for the global coordination of the DNS Root - IP addressing - and other Internet protocol resources?
Largest segment size that the sender is willing to accept
Duplicate address checks; Advertise new data-link identifiers; Update the ARP caches of hosts
IANA
Windowing

18. What TCP/IP protocol suite layer corresponds to the transport layer of the OSI model?
255.255.255.248
Open Systems Interconnection
ICMP Router Discovery Protocol
Host-to-host

19. Disables proxy ARP on an interface
Router(config-if)#no ip proxy-arp
Used by IRDP on some operating systems to discover local routers
4
CWR (1-bit); ECE (1-bit); URG (1-bit); ACK (1-bit); PSH (1-bit); RST (1-bit); SYN (1-bit); FIN (1-bit)

20. What is ICMP Type 3?
RIPv1 and IGRP
Sequence Number + Data payload octets + 1
192.0.2.0/24
Destination Unreachable

21. What is the IPv4 Protocol number for ICMP?
1
IANA
3
Internet

22. What is the other name for the TCP Header Length field?
Data Offset
Echo
Host-to-host
Router(config)#ip netmask-format {bit-count | decimal | hexadecimal}

23. What is the ARP Operation value for a Reverse ARP Reply?
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
Number of octets to be added to the Sequence Number to indicate the end of the urgent data
Router#clear arp-cache [{interface {interface}} | {ip-address}]

24. What is Reverse ARP?
Loose source routing; Strict source routing; Record route; Timestamp
Router Advertisement
Used by a host to obtain the IPv4 address associated with its own MAC address
17

25. What is PSH?
Push
Destination Unreachable
169.254.0.0/16
Host-to-host

26. Which IPv4 address range is reserved for IPv6 to IPv4 (6to4) relays (RFC 3068)?
Each router decrements the TTL
88
Type (8-bit); Code (8-bit); Checksum (16-bit); Variable fields
192.88.99.0/24

27. What are classful routing protocols?

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28. What TCP/IP protocol suite layer corresponds to the physical and data link layers of the OSI model?
All Internet Registries
Don't Fragment
Padding of zeros to ensure that the header ends on a 32-bit boundary
Network interface

29. What is the IPv4 Protocol number for TCP?
1
6
1
Internet Control Message Protocol

30. What is the format of the TCP Header Length field?
Length of header in words (32-bit)
Regional Internet Registry
Internet Assigned Numbers Authority
Sequence Number

31. How does the layers of the TCP/IP protocol suite map to the 7 layers of the OSI model?
Congestion Window Reduced
IANA
1-2 Network interface; 3 Internet; 4 Host-to-host; 5-7 Application
Internet Assigned Numbers Authority

32. What is the TTL field in the IPv4 header?
20 octets
Time to Live
Method where routers - by responding to ARP requests for IP addresses in different subnets - make themselves available to hosts with no default gateway configured
Class A 0; Class B 10; Class C 110; Class D 1110; Class E 1111

33. What is the difference between the ToS and the DiffServ byte?
Reserved (1-bit); DF (1-bit); MF (1-bit)
URG flag set
They are the same byte - but the names and value interpretations are different
Router#show arp

34. What is the prerequisite for using the Urgent Pointer field in the TCP header?
Router#clear arp-cache [{interface {interface}} | {ip-address}]
Loose source routing; Strict source routing; Record route; Timestamp
255.255.255.128
URG flag set

35. What mechanism is used by TCP to provided ordered segment delivery?
Sequence Numbers
4
Host-to-host
RIRs

36. What is ICMP Type 11?
Internet Protocol
127.0.0.0/8
Time Exceeded
ECN-Echo

37. Which RFC defines the special use IPv4 address ranges?
RFC 3330
2
Reserved (1-bit); DF (1-bit); MF (1-bit)
Internet Control Message Protocol

38. What is ICMP Type 0?
Router(config)#ip netmask-format {bit-count | decimal | hexadecimal}
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
Echo Reply

39. Which IPv4 address range is reserved for loopback testing?
Congestion Window Reduced
Router(config)#ip arp proxy disable
127.0.0.0/8
Synchronize

40. What routing protocols are classful?
Router(config)#arp {ip-address} {mac-address} arpa
6
RFC 3330
RIPv1 and IGRP

41. Configures how long a dynamically learned protocol address and its corresponding hardware address remains in the ARP cache
1
Router(config-if)#arp timeout {seconds}
All Internet Registries
CWR (1-bit); ECE (1-bit); URG (1-bit); ACK (1-bit); PSH (1-bit); RST (1-bit); SYN (1-bit); FIN (1-bit)

42. What is added after the option field in the IPv4 header?
20 octets
Padding of zeros to ensure that the header ends on a 32-bit boundary
Synchronize
RIPv1 and IGRP

43. What IPv4 header fields are used for fragmentation?
Windowing
Identifier; Flags and Fragmentation Offset
Regional Internet Registry
IANA

44. Who owns the processes by which public IP address space and AS numbers are allocated and assigned?
192.0.2.0/24
60 octets
ICANN
Largest segment size that the sender is willing to accept

45. What is Inverse ARP?

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46. What is the purpose of a socket?
Number of octets to be added to the Sequence Number to indicate the end of the urgent data
Used by IRDP on some operating systems to discover local routers
Uniquely identify every application in the network
RFC 1918

47. What is the first octet rule for IPv4 address classes in binary?
DSCP (6-bit); ECN (2-bit)
Source Port (16-bit); Destination Port (16-bit); UDP Length (16-bit); Checksum (16-bit)
Network interface
Class A 0; Class B 10; Class C 110; Class D 1110; Class E 1111

48. Which protocol has mostly replaced Reverse ARP?
Identifier; Flags and Fragmentation Offset
DHCP
255.255.255.224
17

49. What is the recommended default TTL?
The next sequence number that the source expects to receive from the destination
Padding of zeros to ensure that the header ends on a 32-bit boundary
64
192.0.2.0/24

50. What is the formula to calculate the next Sequence Number based on the Sequence Number of the current TCP segment?
Internet Service Provider
National Internet Registry
Local Internet Registry
Sequence Number + Data payload octets + 1