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Test your basic knowledge |
Cisco Network Fundamentals - 2
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Subjects
:
cisco
,
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. MSN messenger uses TCP or UDP?
TCP
Unique
Source and destination (ports) - Sequencing - Acknowledgement - Flow control
Connectionless
2. What is the port range for dynamic or private ports
It means ensuring that each segment that the source sends arrives at the destination
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
It works the same on all Layer 1 media
49152 - 65535.
3. What is the proper order of FIN sequence?
It is the most common - and it encapsulates transport layer segments
128
FIN -> FIN.ACK (terminate client to server) - FIN->FIN.ACK->Ack recvd (terminate server to client)
Routing table
4. What is the default DNS port number?
53
Forward the packet to the default route interface (gateway) or just drop/discard the packets
32 - there are four octets of 8 bits each in an IPv4 address
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
5. TCP header provides for
TCP
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 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.
Source and destination (ports) - Sequencing - Acknowledgement - Flow control
6. Routers add routes for the connected networks to their ________________ .
Routing table
20 and 8
Acknowledgment field significant
SMTP
7. What is the purpose of sequence numbers?
UDP - it sends datagrams as 'best effort'
Dynamic routing adds packet-processing overhead - and routers can use static and dynamic routing simultaneously
TFTP - Trivial File Transfer Protocol
Allows the transport layer function on the destination host to reassemble segments in the right order
8. Which of the following are true about TCP and IP?
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9. MTU stands for ?
32 - there are four octets of 8 bits each in an IPv4 address
Maximum transmission unit
SYN -> SYN.ACK->SEQ - ACK = SEQ+1 - SEQ is a random #
Routers (the subnetting process)
10. ACK is?
TCP
Transport
Acknowledgment field significant
Routers (the subnetting process)
11. 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.
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
Packet
12. List three network applications that use TCP
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.
Web browsing - email - file transfer
Reduced network bandwidth - increased overhead - and reduced host functions. The other answers are part of solutions to excessive broadcasts
Segmentation provides the means to send and receive data when running multiple applications concurrently on a computer
13. Port 8080 is?
Segmentation provides the means to send and receive data when running multiple applications concurrently on a computer
POP3
An alternate HTTP port
SMTP
14. What is the purpose of TCP/UDP port numbers?
HTTPS (Secure HTTP)
Window size
UDP - it sends datagrams as 'best effort'
To track the different conversations crossing the network at the same time
15. Name the private address blocks
53
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
Addressing packets with IP addresses - Encapsulation - Routing - Decapsulation
Acknowledgment field significant
16. Which characteristics are part of TCP? Pick two: Reliable - connectionless - no flow control - resends anything not received?
Reliable - connection-oriented protocol (resends if not received)
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
DNS - video-streaming - VoIP
It works the same on all Layer 1 media
17. What is contained in the header of each segment or datagram?
TFTP - Trivial File Transfer Protocol
TCP. It makes larger demands on a network
TCP uses flow control
The source and destination port number
18. How many bits are in an IPv6 address?
FTP
Source and destination (ports) - Sequencing - Acknowledgement - Flow control
128
Addressing packets with IP addresses - Encapsulation - Routing - Decapsulation
19. How many bits are in an IPv4 address?
To track the different conversations crossing the network at the same time
1
It means ensuring that each segment that the source sends arrives at the destination
32 - there are four octets of 8 bits each in an IPv4 address
20. The router a network uses to send and receive messages beyond the network is called a ___________ router.
Gateway
53
Static routing
20 and 8
21. What is the name of the process of removing the OSI Layer 2 information from an IP packet?
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.
17 (A flag is set in the segment header. If this flag actually reads 17 - it is identified as a UDP header)
FIN -> FIN.ACK (terminate client to server) - FIN->FIN.ACK->Ack recvd (terminate server to client)
Decapsulation
22. Which of the following are true about network layer encapsulation?
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.
SYN -> SYN.ACK->SEQ - ACK = SEQ+1 - SEQ is a random #
128
Data link - physical
23. What is the netstat utility used for on a host?
Netstat lists the protocols in use - the local address and port number - the foreign address and port number - and the state of the connection. Also displays active TCP connections - ports on which the computer is listening - Ethernet statistics - th
Maximum transmission unit
Addressing packets with IP addresses - Encapsulation - Routing - Decapsulation
False. It's like a file - only one process can read/write.
24. UDP stands for?
User Datagram Protocol
The default gateway address is the address of a router interface that is connected to the same network as the host.
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
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
25. List three network applications that use UDP
0 - 1023 (total of 1024). The Internet Assigned Numbers Authority (IANA) is responsible for maintaining the official assignments of port numbers for specific uses
The default gateway address is the address of a router interface that is connected to the same network as the host.
SMTP
DNS - video-streaming - VoIP
26. Which protocol ensures more reliable delivery between applications - TCP or UDP?
Netstat -r and route print
TCP. It makes larger demands on a network
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
Dynamic / private
27. Why is IP 'media independent'?
HTTPS (Secure HTTP)
It works the same on all Layer 1 media
2nd and third choices are correct--TCP is reliable and connection-oriented. IP is the one that's unreliable and connectionless. IP operates at the network layer.
Forward the packet to the default route interface (gateway) or just drop/discard the packets
28. An example of a communication that sends a letter to someone without notifying the recipient in advance is called?
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
Connectionless
20 and 8
SMTP
29. IP requires that each sending and receiving device have a __________ IP address.
32 - there are four octets of 8 bits each in an IPv4 address
All
Unique
Reduced network bandwidth - increased overhead - and reduced host functions. The other answers are part of solutions to excessive broadcasts
30. What is the port range for well known ports
It Doesn't - TCP does
0 - 1023 (total of 1024). The Internet Assigned Numbers Authority (IANA) is responsible for maintaining the official assignments of port numbers for specific uses
It works the same on all Layer 1 media
The default gateway address is the address of a router interface that is connected to the same network as the host.
31. Ephermeral port is what type of port
Acknowledgment and reassembly (receipt of packets and putting them in right order)
Dynamic / private
Decapsulation
Purpose - ownership - and geographic location are key ways to divide a network
32. What is the proper order of SYN sequence?
SYN -> SYN.ACK->SEQ - ACK = SEQ+1 - SEQ is a random #
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
Purpose - ownership - and geographic location are key ways to divide a network
128
33. Determines how much data a sending host running TCP/IP can transmit before it must receive an acknowledgment
It means ensuring that each segment that the source sends arrives at the destination
Window size
128
POP3
34. What is the purpose of the ToS field in the IPv4 header?
TCP
It means ensuring that each segment that the source sends arrives at the destination
DNS - video-streaming - VoIP
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.
35. The value of the ACK number field is equal to the client ISN plus ___________ (number)?
Window size
Static routing
1
IRC
36. Which protocol provides just the basic functions for efficiently delivering data pieces between appropriate applications - TCP or UDP?
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37. When an IP packet is decapsulated - the information in the packet is handed to the upper or lower layers for delivery and processing?
49152 - 65535.
It means ensuring that each segment that the source sends arrives at the destination
RIP (Routing Information Protocol)
Upper
38. Which of the following are true about static and dynamic routing?
The source and destination port number
20 and 8
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
Dynamic routing adds packet-processing overhead - and routers can use static and dynamic routing simultaneously
39. The three main features of routes in a routing table are?
Not - these are done by other protocols in other layers
HTTPS (Secure HTTP)
2nd and third choices are correct--TCP is reliable and connection-oriented. IP is the one that's unreliable and connectionless. IP operates at the network layer.
Destination network - next-hop - metric
40. Pieces of information about a route that a routing table contains
Addressing packets with IP addresses - Encapsulation - Routing - Decapsulation
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
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
Next hop - metric and destination network. Routers do not need source address - last hop - or default gateway to find a path to the network.
41. What are three key factors to consider when grouping hosts into a common network?
TFTP - Trivial File Transfer Protocol
Purpose - ownership - and geographic location are key ways to divide a network
Source and destination (ports) - Sequencing - Acknowledgement - Flow control
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.
42. Which of the following are true about IP?
It is the most common - and it encapsulates transport layer segments
The default gateway address is the address of a router interface that is connected to the same network as the host.
Yes - for applications and services such as http - pop - smtp. Client requests services from a specific port.
Does not
43. Port 443 is?
Connectionless - Best effort (unreliable) - media independent
Reduced network bandwidth - increased overhead - and reduced host functions. The other answers are part of solutions to excessive broadcasts
HTTPS (Secure HTTP)
Ephermeral
44. Port 20 is?
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
Does not
FTP
TFTP - Trivial File Transfer Protocol
45. 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?
Static routing
An alternate HTTP port
Not - these are done by other protocols in other layers
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.
46. How does UDP keep track of sequence numbers?
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47. What are the transport layer's responsibilities?
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
TCP
FIN -> FIN.ACK (terminate client to server) - FIN->FIN.ACK->Ack recvd (terminate server to client)
It Doesn't - TCP does
48. When an OSI Layer 4 PDU has been encapsulated at the network layer it is called a ______________.
TCP
Does not
Packet
Maximum transmission unit
49. What kinds of problems are caused by excessive broadcast traffic on a network segment?
0 - 1023 (total of 1024). The Internet Assigned Numbers Authority (IANA) is responsible for maintaining the official assignments of port numbers for specific uses
TCP
Reduced network bandwidth - increased overhead - and reduced host functions. The other answers are part of solutions to excessive broadcasts
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.
50. Port 194 is?
IRC
Dynamic routing adds packet-processing overhead - and routers can use static and dynamic routing simultaneously
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
Routing table
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