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Cisco Network Fundamentals - 2

Instructions:

Answer 50 questions in 15 minutes.
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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 the port range for dynamic or private ports
Purpose - ownership - and geographic location are key ways to divide a network
Connectionless
49152 - 65535.
Synchronize sequence numbers

2. How does UDP keep track of sequence numbers?

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3. Which of the following are true about IP?
The source and destination port number
UDP
It means ensuring that each segment that the source sends arrives at the destination
It is the most common - and it encapsulates transport layer segments

4. MTU stands for ?
32 - there are four octets of 8 bits each in an IPv4 address
The type-of-service field contains an 8-bit binary value that is used to determine the priority of each packet. This enables QoS (Quality of service) to happen.
FIN
Maximum transmission unit

5. What is a common device used to divide/break up a broadcast domain into smaller broadcast domains?
It means ensuring that each segment that the source sends arrives at the destination
Routers (the subnetting process)
Routing table
1024. The lower numbers are the well-known ports.1024 through 49151 are registered ports and used by the host for dynamic port allocation

6. What two commands can be used to view a host's routing table?
SYN -> SYN.ACK->SEQ - ACK = SEQ+1 - SEQ is a random #
Connectionless - Best effort (unreliable) - media independent
Dynamic routing adds packet-processing overhead - and routers can use static and dynamic routing simultaneously
Netstat -r and route print

7. What is the name of the process of removing the OSI Layer 2 information from an IP packet?
10.0.0.0/8 10.0.0.0 to 10.255.255.255 - 172.16.0.0/12 172.16.0.0 to 172.31.255.255 - 192.168.0.0/16 192.168.0.0 to 192.168.255.255
A broadcast domain is a logical part of a network (a network segment) in which any network equipment can transmit data directly to another equipment or device without going through a routing device (assuming the devices share the same subnet and use
Decapsulation
Maximum transmission unit

8. What are the transport layer's responsibilities?
Segmentation provides the means to send and receive data when running multiple applications concurrently on a computer
Keeping track of the individual conversations taking place between applications on the source and destinations hosts - Segmenting data and adding a header - Using header info to reassemble the segments into application data - Passing the assembled da
SMTP
Routing table

9. On a particular network how would you determine the default gateway address for a host?
All
20 and 8
Forward the packet to the default route interface (gateway) or just drop/discard the packets
The default gateway address is the address of a router interface that is connected to the same network as the host.

10. Are well known ports registered
Yes - for applications and services such as http - pop - smtp. Client requests services from a specific port.
53
It adds a header - and adds both source and destination IP addresses. Network layer encapsulation happens only on the original host; other devices can read the data - but they do not remove or alter it until the destination network is reached.
Allows the transport layer function on the destination host to reassemble segments in the right order

11. When the client end of the session has no more data to transfer - it sets the ___________ flag in the header of the segment? (Hint: three-letter acronym)
TCP. It makes larger demands on a network
A broadcast domain is a logical part of a network (a network segment) in which any network equipment can transmit data directly to another equipment or device without going through a routing device (assuming the devices share the same subnet and use
FIN
32 - there are four octets of 8 bits each in an IPv4 address

12. Which of the following are true about TCP and IP?

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13. Port 110 is?
It is used by both routers and hosts. The second one is incorrect because IP uses addressing information in the header to determine the best path for the packet. 'Reliable' is incorrect because IP is only a 'best effort' protocol
128
POP3
49152 - 65535.

14. Port 194 is?
IRC
Not - these are done by other protocols in other layers
Does not
POP3

15. How many bits are in an IPv6 address?
128
Next hop - metric and destination network. Routers do not need source address - last hop - or default gateway to find a path to the network.
Destination device is there - Figures out if it has an active service running and is accepting requests on the right port - Tells the destination device that it wants to communicate on said port
Gateway

16. Encapsulation occurs at all - some or none of the layers of the OSI model?
All
FIN
It works the same on all Layer 1 media
It Doesn't - TCP does

17. End systems use port numbers to select the proper application. What is the lowest port number that can be dynamically assigned by the host system? 1 - 128 - 256 or 1024?
128
Routers (the subnetting process)
1024. The lower numbers are the well-known ports.1024 through 49151 are registered ports and used by the host for dynamic port allocation
An alternate HTTP port

18. What is contained in the header of each segment or datagram?
Decapsulation
Does not
Acknowledgment and reassembly (receipt of packets and putting them in right order)
The source and destination port number

19. What does segmentation provide to communications?
IRC
Destination network - next-hop - metric
Segmentation provides the means to send and receive data when running multiple applications concurrently on a computer
A broadcast domain is a logical part of a network (a network segment) in which any network equipment can transmit data directly to another equipment or device without going through a routing device (assuming the devices share the same subnet and use

20. How many bits are in an IPv4 address?
Purpose - ownership - and geographic location are key ways to divide a network
To reassemble the segments into data - To identify the application layer protocol - To indicate the number of the next expected byte - To show the maximum number of bytes allowed during a session. Allows the receiving host to reassemble segments in p
Decapsulation
32 - there are four octets of 8 bits each in an IPv4 address

21. Port 69 is?
Acknowledgment and reassembly (receipt of packets and putting them in right order)
Window size
SYN -> SYN.ACK->SEQ - ACK = SEQ+1 - SEQ is a random #
TFTP - Trivial File Transfer Protocol

22. UDP stands for?
It works the same on all Layer 1 media
An alternate HTTP port
User Datagram Protocol
The router matches the destination address in the packet header with the destination network of a route in the routing table and forwards the packet to the next-hop router specified by that route

23. Which of the following are true about static and dynamic routing?
TCP
FIN -> FIN.ACK (terminate client to server) - FIN->FIN.ACK->Ack recvd (terminate server to client)
IP. TCP is connection-oriented - and UDP is connectionless but works on the transport layer.
Dynamic routing adds packet-processing overhead - and routers can use static and dynamic routing simultaneously

24. Name the private address blocks
It is the most common - and it encapsulates transport layer segments
10.0.0.0/8 10.0.0.0 to 10.255.255.255 - 172.16.0.0/12 172.16.0.0 to 172.31.255.255 - 192.168.0.0/16 192.168.0.0 to 192.168.255.255
The source and destination port number
Maximum transmission unit

25. Which of the following are not functions of the network layer?
Reduced network bandwidth - increased overhead - and reduced host functions. The other answers are part of solutions to excessive broadcasts
53
Delivery reliability and application data analysis. The first is a transport layer concern - and the second is the presentation layer. Routing - addressing packets with an IP adress - encapsulation and decapsulation are functions of the network layer
Does not

26. What is the purpose of the ToS field in the IPv4 header?
To track the different conversations crossing the network at the same time
The type-of-service field contains an 8-bit binary value that is used to determine the priority of each packet. This enables QoS (Quality of service) to happen.
Telnet
It Doesn't - TCP does

27. Port 20 is?
Gateway
FTP
SMTP
UDP - it sends datagrams as 'best effort'

28. Port 23 is?
IP. TCP is connection-oriented - and UDP is connectionless but works on the transport layer.
Addressing packets with IP addresses - Encapsulation - Routing - Decapsulation
Telnet
RIP (Routing Information Protocol)

29. At the transport layer - which of the following controls is used to keep a transmitting host from overflowing the buffers of a receiving host? Choose one: Best effort - encryption - flow control - congestion avoidance?
TCP uses flow control
TCP
UDP
17 (A flag is set in the segment header. If this flag actually reads 17 - it is identified as a UDP header)

30. MSN messenger uses TCP or UDP?
Addressing packets with IP addresses - Encapsulation - Routing - Decapsulation
TCP
DNS - video-streaming - VoIP
TCP. It makes larger demands on a network

31. Why is IP 'media independent'?
To reassemble the segments into data - To identify the application layer protocol - To indicate the number of the next expected byte - To show the maximum number of bytes allowed during a session. Allows the receiving host to reassemble segments in p
Dynamic / private
It works the same on all Layer 1 media
FIN -> FIN.ACK (terminate client to server) - FIN->FIN.ACK->Ack recvd (terminate server to client)

32. What kinds of problems are caused by excessive broadcast traffic on a network segment?
Reduced network bandwidth - increased overhead - and reduced host functions. The other answers are part of solutions to excessive broadcasts
Source and destination (ports) - Sequencing - Acknowledgement - Flow control
FIN -> FIN.ACK (terminate client to server) - FIN->FIN.ACK->Ack recvd (terminate server to client)
Gateway

33. List three network applications that use UDP
DNS - video-streaming - VoIP
Yes - for applications and services such as http - pop - smtp. Client requests services from a specific port.
TCP
Netstat -r and route print

34. Port 443 is?
0 - 1023 (total of 1024). The Internet Assigned Numbers Authority (IANA) is responsible for maintaining the official assignments of port numbers for specific uses
49152 - 65535.
Connectionless - Best effort (unreliable) - media independent
HTTPS (Secure HTTP)

35. What is the port range for Registered ports
It works the same on all Layer 1 media
Purpose - ownership - and geographic location are key ways to divide a network
RIP (Routing Information Protocol)
1024 - 49151. Unlike ports with lower numbers - developers of new TCP/UDP services can select a specific number to register with IANA rather than having a number assigned to them. Using registered ports also avoids the additional security restriction

36. IP requires that each sending and receiving device have a __________ IP address.
The type-of-service field contains an 8-bit binary value that is used to determine the priority of each packet. This enables QoS (Quality of service) to happen.
To track the different conversations crossing the network at the same time
It adds a header - and adds both source and destination IP addresses. Network layer encapsulation happens only on the original host; other devices can read the data - but they do not remove or alter it until the destination network is reached.
Unique

37. What is the default DNS port number?
DNS - video-streaming - VoIP
Keeping track of the individual conversations taking place between applications on the source and destinations hosts - Segmenting data and adding a header - Using header info to reassemble the segments into application data - Passing the assembled da
Unique
53

38. The three main features of routes in a routing table are?
It adds a header - and adds both source and destination IP addresses. Network layer encapsulation happens only on the original host; other devices can read the data - but they do not remove or alter it until the destination network is reached.
Destination network - next-hop - metric
Source and destination (ports) - Sequencing - Acknowledgement - Flow control
A broadcast domain is a logical part of a network (a network segment) in which any network equipment can transmit data directly to another equipment or device without going through a routing device (assuming the devices share the same subnet and use

39. Ephermeral port is what type of port
Dynamic routing adds packet-processing overhead - and routers can use static and dynamic routing simultaneously
0 - 1023 (total of 1024). The Internet Assigned Numbers Authority (IANA) is responsible for maintaining the official assignments of port numbers for specific uses
Dynamic / private
Allows the transport layer function on the destination host to reassemble segments in the right order

40. What is the purpose of TCP/UDP port numbers?
53
To track the different conversations crossing the network at the same time
TCP. It makes larger demands on a network
Forward the packet to the default route interface (gateway) or just drop/discard the packets

41. What are three key factors to consider when grouping hosts into a common network?
10.0.0.0/8 10.0.0.0 to 10.255.255.255 - 172.16.0.0/12 172.16.0.0 to 172.31.255.255 - 192.168.0.0/16 192.168.0.0 to 192.168.255.255
Yes - for applications and services such as http - pop - smtp. Client requests services from a specific port.
Purpose - ownership - and geographic location are key ways to divide a network
Gateway

42. What is the proper order of SYN sequence?
HTTPS (Secure HTTP)
Web browsing - email - file transfer
Data link - physical
SYN -> SYN.ACK->SEQ - ACK = SEQ+1 - SEQ is a random #

43. An example of a communication that sends a letter to someone without notifying the recipient in advance is called?
Addressing packets with IP addresses - Encapsulation - Routing - Decapsulation
Connectionless
Source and destination (ports) - Sequencing - Acknowledgement - Flow control
Data link - physical

44. UDP does or does not create a session?
All
SYN -> SYN.ACK->SEQ - ACK = SEQ+1 - SEQ is a random #
Does not
Static routing

45. What information does a router need to successfully forward packets?
It adds a header - and adds both source and destination IP addresses. Network layer encapsulation happens only on the original host; other devices can read the data - but they do not remove or alter it until the destination network is reached.
HTTPS (Secure HTTP)
The router matches the destination address in the packet header with the destination network of a route in the routing table and forwards the packet to the next-hop router specified by that route
An alternate HTTP port

46. SYN is?
Synchronize sequence numbers
Transport
Web browsing - email - file transfer
SMTP

47. The value of the ACK number field is equal to the client ISN plus ___________ (number)?
Forward the packet to the default route interface (gateway) or just drop/discard the packets
UDP - it sends datagrams as 'best effort'
1
TCP. It makes larger demands on a network

48. What is the protocol number for UDP?
17 (A flag is set in the segment header. If this flag actually reads 17 - it is identified as a UDP header)
Acknowledgment field significant
User Datagram Protocol
TCP. It makes larger demands on a network

49. Routes to remote networks with the associated next-hops can be manually configured on the router. What is the same for this type of routing?
Telnet
Static routing
HTTPS (Secure HTTP)
TCP uses flow control

50. Which of the following is true about IP?

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