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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 SYN?
Synchronize
Reserved (1-bit); DF (1-bit); MF (1-bit)
0.0.0.0/8
Sequence Number

2. What is the content of the the Urgent Pointer field in the TCP header?
RIPv1 and IGRP
192.88.99.0/24
Number of octets to be added to the Sequence Number to indicate the end of the urgent data
Acknowledgement

3. What is the first octet rule for IPv4 address classes in binary?
Open Systems Interconnection
Class A 0; Class B 10; Class C 110; Class D 1110; Class E 1111
Maximum Segment Size (MSS)
ICANN

4. Deletes dynamic entries from the ARP cache
NIRs
Echo Reply
National Internet Registry
Router#clear arp-cache [{interface {interface}} | {ip-address}]

5. What is the IPv4 Protocol number for IGMP?
ICANN
Time Exceeded
2
Internet Corporation for Assigned Network Numbers

6. What is URG?
Urgent
89
255.255.255.224
Internet Service Provider

7. What is RIR?
6
ICANN and IANA
Per-Hop Behaviour (PHB)
Regional Internet Registry

8. What TCP/IP protocol suite layer corresponds to the session - presentation and application layers of the OSI model?
Application
National Internet Registry
Acknowledgement
Maximum Segment Size (MSS)

9. What is proxy ARP?
Method where routers - by responding to ARP requests for IP addresses in different subnets - make themselves available to hosts with no default gateway configured
0x0800
Class A 0; Class B 10; Class C 110; Class D 1110; Class E 1111
1-2 Network interface; 3 Internet; 4 Host-to-host; 5-7 Application

10. What is the IPv4 Protocol number for OSPF?
All Internet Registries
Echo Reply
Protocols that don't include subnet masks in their routing updates
89

11. What is the IPv4 Protocol number for IP in IP encapsulation?
IP Precedence (3-bit); ToS (4-bit); Reserved (1-bit)
RFC 791
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

12. What is ICMP?
Maximum Segment Size (MSS)
Internet Control Message Protocol
Time to Live
Protocols that don't include subnet masks in their routing updates

13. What is NIR?
National Internet Registry
47
They are the same byte - but the names and value interpretations are different
Internet

14. How does the layers of the TCP/IP protocol suite map to the 7 layers of the OSI model?
Internet Control Message Protocol
IANA
RFC 791
1-2 Network interface; 3 Internet; 4 Host-to-host; 5-7 Application

15. What is a TCP Acknowledgement Number?
Router Selection
3
The next sequence number that the source expects to receive from the destination
CWR (1-bit); ECE (1-bit); URG (1-bit); ACK (1-bit); PSH (1-bit); RST (1-bit); SYN (1-bit); FIN (1-bit)

16. What is OSI?
National Internet Registry
255.255.255.240
Open Systems Interconnection
Internet

17. What is RST?
Duplicate address checks; Advertise new data-link identifiers; Update the ARP caches of hosts
Uniquely identify every application in the network
Used by IRDP on some operating systems to discover local routers
Reset

18. 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
4
An ARP request issued by a host with its own IPv4 address as the target address
1 Determine how many subnets are required; 2 Determine how many hosts per subnet are required; 3 Determine the subnet mask for each subnet; 4 Calculate the network address for each subnet

19. What is the IPv4 Protocol number for EIGRP?
88
Network interface
1-2 Network interface; 3 Internet; 4 Host-to-host; 5-7 Application
Electrical/Optical - Mechanical - Functional and Procedural

20. Who group public IPv4 address space by major geographic region?
IANA
Protocols that include subnet masks in their routing updates
ICANN and IANA
LIRs

21. What are the protocol categories that describe the physical layer?
Transmission Control Protocol
1
Time to Live
Electrical/Optical - Mechanical - Functional and Procedural

22. What is TCP?
RFC 1918
Each router decrements the TTL
9
Transmission Control Protocol

23. What is ISP?
Protocols that include subnet masks in their routing updates
Router#debug arp
Internet Service Provider
6

24. What is the IPv4 protocol number for UDP?
URG flag set
17
RIRs
4

25. Disables proxy ARP on an interface
ICMP Router Discovery Protocol
Router(config-if)#no ip proxy-arp
47
Sequence Numbers

26. What is the function 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
127.0.0.0/8
Identifier; Flags and Fragmentation Offset
255.255.255.248

27. Configures how long a dynamically learned protocol address and its corresponding hardware address remains in the ARP cache
Router(config)#arp {ip-address} {mac-address} arpa
Router(config-if)#arp timeout {seconds}
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

28. What is the IPv4 Protocol number for GRE?
6
1
47
Time to Live

29. What is ICANN?
127.0.0.0/8
Internet Corporation for Assigned Network Numbers
Length of header in words (32-bit)
1

30. What is the ARP Operation value for an Inverse ARP Request?
8
Router(config)#arp {ip-address} {mac-address} arpa
Don't Fragment
National Internet Registry

31. Which IPv4 address range is reserved for IPv6 to IPv4 (6to4) relays (RFC 3068)?
Used by IRDP on some operating systems to discover local routers
192.88.99.0/24
Router(config-if)#no ip redirects
Transmission Control Protocol

32. What is the format of the Flags field in the IPv4 header?
Reserved (1-bit); DF (1-bit); MF (1-bit)
Used by a host to obtain the IP address associated with another host's MAC address
Socket
255.255.255.240

33. Which IPv4 address range is reserved for benchmark testing of Internet devices (RFC 2544)?
1
198.18.0.0/15
Router#show arp
Largest segment size that the sender is willing to accept

34. What are classless routing protocols?
Protocols that include subnet masks in their routing updates
Urgent
RFC 791
Host-to-host

35. What is the IPv4 Protocol number for TCP?
255.255.255.128
LIRs
Windowing
6

36. What is LIR?
Synchronize
Source Port (16-bit); Destination Port (16-bit); UDP Length (16-bit); Checksum (16-bit)
Local Internet Registry
Loose source routing; Strict source routing; Record route; Timestamp

37. What mechanism is used by TCP to provided ordered segment delivery?
Router#clear arp-cache [{interface {interface}} | {ip-address}]
Regional Internet Registry
Router#debug arp
Sequence Numbers

38. What is the content of the TCP Window Size 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
Data Offset
Reset
Router(config-if)#arp timeout {seconds}

39. What is the format of the TCP Header Length field?
2
0 Routine; 1 Priority; 2 Immediate; 3 Flash; 4 Flash Override; 5 Critical; 6 Internetwork Control; 7 Network Control
Length of header in words (32-bit)
4

40. Who are LIRs?
IANA
Open Systems Interconnection
Used by routers to notify hosts of another router on the data link that should be used for a particular destination
Mostly large ISPs - enterprises - or academic institutions

41. What TCP/IP protocol suite layer corresponds to the transport layer of the OSI model?
Acknowledgements - checksums and timers
Host-to-host
Identifier; Flags and Fragmentation Offset
An ARP request issued by a host with its own IPv4 address as the target address

42. Enables debugging output for ARP transactions
1 Determine how many subnets are required; 2 Determine how many hosts per subnet are required; 3 Determine the subnet mask for each subnet; 4 Calculate the network address for each subnet
192.0.2.0/24
4
Router#debug arp

43. What is the other name for the TCP Header Length field?
Internet Corporation for Assigned Network Numbers
Data Offset
Regional Internet Registry
20 octets

44. What is the ARP Protocol type value for IPv4?
0x0800
Electrical/Optical - Mechanical - Functional and Procedural
1
Open Systems Interconnection

45. What is the ARP Hardware address length value for Ethernet?
The next sequence number that the source expects to receive from the destination
All Internet Registries
0.0.0.0/8
6

46. What is the difference between the ToS and the DiffServ byte?
They are the same byte - but the names and value interpretations are different
Used by a host to obtain the IP address associated with another host's MAC address
Time to Live
Protocols that include subnet masks in their routing updates

47. What is the format of an 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);
6
Uniquely identify every application in the network
ICANN

48. Who owns the processes by which public IP address space and AS numbers are allocated and assigned?
ICANN
Time Exceeded
Mostly large ISPs - enterprises - or academic institutions
Router#debug arp

49. What is the name of the queuing and forwarding of IP packets based on DiffServ?
Class A 1-126; Class B 128-191; Class C 192-223; Class D 224-239; Class E 240-254
Reserved (1-bit); DF (1-bit); MF (1-bit)
Used by a host to obtain the IP address associated with another host's MAC address
Per-Hop Behaviour (PHB)

50. What TCP/IP protocol suite layer corresponds to the physical and data link layers of the OSI model?
Sequence Number
Padding of zeros to ensure that the header ends on a 32-bit boundary
Host-to-host
Network interface