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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 are classful routing protocols?

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2. What is the format of the Flags field in the IPv4 header?
Reserved (1-bit); DF (1-bit); MF (1-bit)
Router(config)#ip netmask-format {bit-count | decimal | hexadecimal}
4
Push

3. What is the first octet rule for IPv4 address classes in binary?
More Fragments follow
64
Class A 0; Class B 10; Class C 110; Class D 1110; Class E 1111
Router(config)#arp {ip-address} {mac-address} arpa

4. What is gratuitous ARP?
2
An ARP request issued by a host with its own IPv4 address as the target address
ECN-Echo
Both the TCP header and the encapsulated data

5. What are classless routing protocols?
Per-Hop Behaviour (PHB)
Router(config-if)#arp timeout {seconds}
ICANN
Protocols that include subnet masks in their routing updates

6. What is prefix /28 in decimal notation?
Synchronize
0x0800
Protocols that don't include subnet masks in their routing updates
255.255.255.240

7. What is RIR?
Regional Internet Registry
9
Router(config)#arp {ip-address} {mac-address} arpa
Internet

8. What is CWR?
6
Congestion Window Reduced
Uniquely identify every application in the network
CWR (1-bit); ECE (1-bit); URG (1-bit); ACK (1-bit); PSH (1-bit); RST (1-bit); SYN (1-bit); FIN (1-bit)

9. What is TCP?
255.255.255.224
Used by IRDP on some operating systems to discover local routers
3
Transmission Control Protocol

10. What is the maximum length of an IPv4 header?
6
60 octets
Internet Assigned Numbers Authority
Sequence Number

11. What mechanisms are used by TCP to provide reliable segment delivery?
1
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
They are the same byte - but the names and value interpretations are different

12. What is the IPv4 Protocol number for IP in IP encapsulation?
1
Urgent
Internet Control Message Protocol
4

13. What is the formula to calculate the next Sequence Number based on the Sequence Number of the current TCP segment?
ICMP Router Discovery Protocol
Sequence Number + Data payload octets + 1
RFC 1918
Push

14. Which IPv4 address range is reserved for loopback testing?
Used by IRDP on some operating systems to discover local routers
127.0.0.0/8
Padding of zeros to ensure that the header ends on a 32-bit boundary
Class A 0; Class B 10; Class C 110; Class D 1110; Class E 1111

15. What is the name of the queuing and forwarding of IP packets based on DiffServ?
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
Identifier; Flags and Fragmentation Offset
Per-Hop Behaviour (PHB)
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

16. What is the IPv4 Protocol number for GRE?
Maximum Segment Size (MSS)
192.0.2.0/24
47
1

17. What is OSI?
Open Systems Interconnection
64
Network interface
Source Port (16-bit); Destination Port (16-bit); UDP Length (16-bit); Checksum (16-bit)

18. What is prefix /26 in decimal notation?
17
255.255.255.192
Router#show arp
Router(config)#ip arp proxy disable

19. Who assigns IP address space to its own customers?
Mostly large ISPs - enterprises - or academic institutions
LIRs
1
URG flag set

20. What IPv4 header fields are used for fragmentation?
Identifier; Flags and Fragmentation Offset
RIRs
169.254.0.0/16
6

21. Who owns the processes by which public IP address space and AS numbers are allocated and assigned?
Time Exceeded
ICANN
Final
Synchronize

22. Disables the sending of ICMP redirect messages
4
Class A 0; Class B 10; Class C 110; Class D 1110; Class E 1111
Router(config-if)#no ip redirects
Internet

23. What is SYN?
RFC 1918
Synchronize
Windowing
Mostly large ISPs - enterprises - or academic institutions

24. What is the purpose of a socket?
Protocols that include subnet masks in their routing updates
Sequence Number + Data payload octets + 1
Uniquely identify every application in the network
64

25. What is the recommended default TTL?
169.254.0.0/16
64
Don't Fragment
Sequence Number + Data payload octets + 1

26. Enables debugging output for ARP transactions
1-2 Network interface; 3 Internet; 4 Host-to-host; 5-7 Application
3
Router#debug arp
1

27. What are the protocol categories that describe the physical layer?
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
Electrical/Optical - Mechanical - Functional and Procedural
Data Offset
Windowing

28. What is the ARP Operation value for an ARP Request?
1
RFC 791
89
Class A 1-126; Class B 128-191; Class C 192-223; Class D 224-239; Class E 240-254

29. 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
Reserved (1-bit); DF (1-bit); MF (1-bit)
IANA
Reset

30. What is covered by the TCP Checksum field?
RFC 791
Both the TCP header and the encapsulated data
Router#clear arp-cache [{interface {interface}} | {ip-address}]
4

31. What is ICMP Type 8?
Echo
Push
CWR (1-bit); ECE (1-bit); URG (1-bit); ACK (1-bit); PSH (1-bit); RST (1-bit); SYN (1-bit); FIN (1-bit)
0 Routine; 1 Priority; 2 Immediate; 3 Flash; 4 Flash Override; 5 Critical; 6 Internetwork Control; 7 Network Control

32. What is the IPv4 Protocol number for IGMP?
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
9
2
Reset

33. What is added after the option field in the IPv4 header?
Class A 1-126; Class B 128-191; Class C 192-223; Class D 224-239; Class E 240-254
Router(config)#ip netmask-format {bit-count | decimal | hexadecimal}
Padding of zeros to ensure that the header ends on a 32-bit boundary
Class A 0; Class B 10; Class C 110; Class D 1110; Class E 1111

34. What is ICMP Type 0?
Reset
2
88
Echo Reply

35. What are the IP Precedence values?
Internet Control Message Protocol
0 Routine; 1 Priority; 2 Immediate; 3 Flash; 4 Flash Override; 5 Critical; 6 Internetwork Control; 7 Network Control
RFC 791
Duplicate address checks; Advertise new data-link identifiers; Update the ARP caches of hosts

36. What is LIR?
20 octets
Local Internet Registry
Used by routers to notify hosts of another router on the data link that should be used for a particular destination
Number of octets to be added to the Sequence Number to indicate the end of the urgent data

37. What is the format of the TCP Header 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
Offset - in units of eight octets - from the beginning of the original header to the beginning of the fragment
Length of header in words (32-bit)
Source Port (16-bit); Destination Port (16-bit); UDP Length (16-bit); Checksum (16-bit)

38. Adds a permanent static ARP entry for an Ethernet host
Router(config)#arp {ip-address} {mac-address} arpa
Open Systems Interconnection
Acknowledgement
255.255.255.248

39. What is ICMP Type 5?
ICANN
Redirect
Protocols that don't include subnet masks in their routing updates
Length of header in words (32-bit)

40. How can the receiver determine the size of a packet's data payload based on the IPv4 header?
Router(config-if)#no ip proxy-arp
Class A 0; Class B 10; Class C 110; Class D 1110; Class E 1111
Subtract Header Length field from Total Length field
255.255.255.240

41. Disables proxy ARP on an interface
Host-to-host
Router(config-if)#no ip proxy-arp
RFC 791
4

42. What is the format of an ICMP header?
127.0.0.0/8
89
Loose source routing; Strict source routing; Record route; Timestamp
Type (8-bit); Code (8-bit); Checksum (16-bit); Variable fields

43. What is ICMP Type 9?
Router Advertisement
IANA
Application
Router#debug arp

44. What routing protocols are classful?
60 octets
Windowing
RIPv1 and IGRP
Number of octets to be added to the Sequence Number to indicate the end of the urgent data

45. What mechanism is used by TCP to provided ordered segment delivery?
Acknowledgements - checksums and timers
Sequence Numbers
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
Host-to-host

46. What is the value of the TCP Reserved field?
0
Congestion Window Reduced
Class A 0; Class B 10; Class C 110; Class D 1110; Class E 1111
9

47. What is the first octet rule for IPv4 address classes in decimal?
1
Class A 1-126; Class B 128-191; Class C 192-223; Class D 224-239; Class E 240-254
RFC 791
Local Internet Registry

48. What field identifies where the TCP encapsulated data fits within the data stream from the sender?
255.255.255.224
20 octets
Maximum Segment Size (MSS)
Sequence Number

49. Displays the ARP cache of a router
Protocols that include subnet masks in their routing updates
Router(config)#arp {ip-address} {mac-address} arpa
Router#show arp
LIRs

50. What is ICANN?
Acknowledgements - checksums and timers
National Internet Registry
Internet Corporation for Assigned Network Numbers
Duplicate address checks; Advertise new data-link identifiers; Update the ARP caches of hosts