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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.
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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 covered by the TCP Checksum field?
46
DSCP (6-bit); ECN (2-bit)
Both the TCP header and the encapsulated data
Used by a host to obtain the IP address associated with another host's MAC address

2. What is added after the Option field in the TCP header?
Urgent
Router Selection
Padding of zeros to ensure that the header ends on a 32-bit boundary
2

3. What is the IPv4 Protocol number of RSVP?
46
RFC 3330
The next sequence number that the source expects to receive from the destination
Redirect

4. What is the ARP Operation value for an Inverse ARP Request?
Method where routers - by responding to ARP requests for IP addresses in different subnets - make themselves available to hosts with no default gateway configured
Maximum Segment Size (MSS)
1
8

5. What is prefix /25 in decimal notation?
Source Port (16-bit); Destination Port (16-bit); UDP Length (16-bit); Checksum (16-bit)
Transmission Control Protocol
255.255.255.128
89

6. Configures how long a dynamically learned protocol address and its corresponding hardware address remains in the ARP cache
10.0.0.0/8; 172.16.0.0/12; 192.168.0.0/16
Router(config-if)#arp timeout {seconds}
They are the same byte - but the names and value interpretations are different
RIPv1 and IGRP

7. How does the layers of the TCP/IP protocol suite map to the 7 layers of the OSI model?
Final
1-2 Network interface; 3 Internet; 4 Host-to-host; 5-7 Application
IPv4 and IPv6
Length of header in words (32-bit)

8. Disables proxy ARP on all interfaces
8
Uniquely identify every application in the network
Router(config)#ip arp proxy disable
Echo Reply

9. What is the content of the the Urgent Pointer field in the TCP header?
64
169.254.0.0/16
4
Number of octets to be added to the Sequence Number to indicate the end of the urgent data

10. Disables proxy ARP on an interface
Acknowledgement
Reserved (1-bit); DF (1-bit); MF (1-bit)
Internet Control Message Protocol
Router(config-if)#no ip proxy-arp

11. What is ARP?
3
Address Resolution Protocol
Open Systems Interconnection
89

12. What is prefix /28 in decimal notation?
255.255.255.240
URG flag set
Sequence Number
Padding of zeros to ensure that the header ends on a 32-bit boundary

13. What is gratuitous ARP?
An ARP request issued by a host with its own IPv4 address as the target address
Router#debug arp
RIRs
RFC 1918

14. Which IPv4 address range is reserved for IPv6 to IPv4 (6to4) relays (RFC 3068)?
Synchronize
Don't Fragment
192.88.99.0/24
Router(config)#arp {ip-address} {mac-address} arpa

15. What is the recommended default TTL?
IANA
Sequence Numbers
Time Exceeded
64

16. What is the ARP Protocol type value for IPv4?
Internet Assigned Numbers Authority
0x0800
Router(config-if)#no ip proxy-arp
Windowing

17. Specifies the format in which subnet masks are displayed in show command output
Host-to-host
20 octets
17
Router(config)#ip netmask-format {bit-count | decimal | hexadecimal}

18. What is the IPv4 Protocol number for GRE?
They are the same byte - but the names and value interpretations are different
CWR (1-bit); ECE (1-bit); URG (1-bit); ACK (1-bit); PSH (1-bit); RST (1-bit); SYN (1-bit); FIN (1-bit)
Data Offset
47

19. What is a TCP port number of an application called when it is coupled with the IP address of the server?
Socket
Reserved (1-bit); DF (1-bit); MF (1-bit)
4
0.0.0.0/8

20. What is ICMP Type 0?
Echo Reply
More Fragments follow
1
Used by a host to obtain the IPv4 address associated with its own MAC address

21. What are the IP Precedence values?
255.255.255.240
Congestion Window Reduced
0 Routine; 1 Priority; 2 Immediate; 3 Flash; 4 Flash Override; 5 Critical; 6 Internetwork Control; 7 Network Control
Router(config-if)#no ip redirects

22. What is the IPv4 Protocol number for ICMP?
1
Router(config-if)#arp timeout {seconds}
Sequence Numbers
Router(config)#arp {ip-address} {mac-address} arpa

23. What is ICANN?
They are the same byte - but the names and value interpretations are different
Internet Corporation for Assigned Network Numbers
Loose source routing; Strict source routing; Record route; Timestamp
Time Exceeded

24. What is the purpose of a socket?
National Internet Registry
1
Uniquely identify every application in the network
20 octets

25. Disables the sending of ICMP redirect messages
2
NIRs
Router(config-if)#no ip redirects
IPv4 and IPv6

26. What is prefix /26 in decimal notation?
6
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
255.255.255.192
Transmission Control Protocol

27. What is ICMP Type 8?
10.0.0.0/8; 172.16.0.0/12; 192.168.0.0/16
Echo
Protocols that include subnet masks in their routing updates
192.0.2.0/24

28. What are the uses of gratuitous ARP?
RIPv1 and IGRP
Duplicate address checks; Advertise new data-link identifiers; Update the ARP caches of hosts
Router(config)#arp {ip-address} {mac-address} arpa
Sequence Numbers

29. What is the difference between the ToS and the DiffServ byte?
They are the same byte - but the names and value interpretations are different
Router(config)#ip netmask-format {bit-count | decimal | hexadecimal}
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
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

30. What is URG?
Sequence Numbers
LIRs
255.255.255.224
Urgent

31. What is prefix /29 in decimal notation?
255.255.255.248
6
Internet Corporation for Assigned Network Numbers
2

32. What is OSI?
IPv4 and IPv6
Open Systems Interconnection
Protocols that don't include subnet masks in their routing updates
Method where routers - by responding to ARP requests for IP addresses in different subnets - make themselves available to hosts with no default gateway configured

33. What IPv4 header fields are used for fragmentation?
Router Selection
Identifier; Flags and Fragmentation Offset
2
169.254.0.0/16

34. What is the Fragment Offset field in the IPv4 header?
ECN-Echo
Offset - in units of eight octets - from the beginning of the original header to the beginning of the fragment
Reserved (1-bit); DF (1-bit); MF (1-bit)
ICANN

35. Deletes dynamic entries from the ARP cache
Router#clear arp-cache [{interface {interface}} | {ip-address}]
Minimize Delay (1-bit); Maximise Throughput (1-bit); Maximise Reliability (1-bit); Minimize Monetary Cost (1-bit)
88
6

36. What is the format of the Flags field in the TCP header?
CWR (1-bit); ECE (1-bit); URG (1-bit); ACK (1-bit); PSH (1-bit); RST (1-bit); SYN (1-bit); FIN (1-bit)
RIPv1 and IGRP
Time Exceeded
Class A 0; Class B 10; Class C 110; Class D 1110; Class E 1111

37. What is NIR?
Offset - in units of eight octets - from the beginning of the original header to the beginning of the fragment
192.0.2.0/24
IANA
National Internet Registry

38. What mechanisms are used by TCP to provide reliable segment delivery?
4
Acknowledgements - checksums and timers
Data Offset
6

39. What is the function of ICMP redirect messages?
Type (8-bit); Code (8-bit); Checksum (16-bit); Variable fields
Acknowledgement
9
Used by routers to notify hosts of another router on the data link that should be used for a particular destination

40. What is SYN?
Synchronize
Both the TCP header and the encapsulated data
255.255.255.240
Sequence Numbers

41. What are the most frequently used options in the IPv4 header?
RFC 1918
Type (8-bit); Code (8-bit); Checksum (16-bit); Variable fields
127.0.0.0/8
Loose source routing; Strict source routing; Record route; Timestamp

42. Who owns the processes by which public IP address space and AS numbers are allocated and assigned?
ICANN
URG flag set
Maximum Segment Size (MSS)
Router(config)#arp {ip-address} {mac-address} arpa

43. What is PSH?
2
Router(config-if)#no ip proxy-arp
Push
2

44. What is ECE?
ECN-Echo
1
1
NIRs

45. Who allocates IP address space and AS numbers to RIRs?
Method where routers - by responding to ARP requests for IP addresses in different subnets - make themselves available to hosts with no default gateway configured
Used by a host to obtain the IPv4 address associated with its own MAC address
Used by IRDP on some operating systems to discover local routers
IANA

46. What is the name of the queuing and forwarding of IP packets based on DiffServ?
Per-Hop Behaviour (PHB)
47
All Internet Registries
Acknowledgement

47. What is the IPv4 Protocol number for IGMP?
2
National Internet Registry
0
Type (8-bit); Code (8-bit); Checksum (16-bit); Variable fields

48. What are the most common IP version numbers?
Router#debug arp
IPv4 and IPv6
Sequence Number
Application

49. What is the ARP Operation value for a Reverse ARP Reply?
Both the TCP header and the encapsulated data
An ARP request issued by a host with its own IPv4 address as the target address
Final
4

50. What are classful routing protocols?

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