Computer Network Exam Review

A set of practice flashcards covering key concepts and terminology in computer networking, prepared for exam review.

What is the IPv4 addressing format limit of networks under Class C addresses?

2^21

What is true when discussing FDMA?

Each station is assigned a fixed frequency band.

What does VLAN stand for?

Virtual Local Area Network

What is a main advantage of a centralized control plane?

Easier network management.

In the ISO/OSI stack, what is the layer number of the physical layer?

1

What is true about half-duplex communication?

Only one of the two devices can transmit at a time.

What does SDN stand for?

Software Defined Networking

What is the function of the checksum field in a UDP segment?

To detect errors in the transmitted segment.

What describes a Local Area Network (LAN)?

 The group of computers and devices are connected together by a switch or stack of switches, using a private addressing scheme as defined by the TCP/IP protocol

Which statement best describes UDP?

Unreliable and connectionless.

What is true about polling 'Taking turns' MAC protocols?

The master node invites other nodes to transmit in turn.

What is true about client-server communication?

Computers provide resources and offer services to other computers.

What is true about direct broadcast communication?

Useful when a device in one network wants to transfer packet stream to all devices over the other network

In BGP, which attribute identifies the router within an AS?

NEXT-HOP

What is true about the User Datagram Protocol?

It is a connectionless protocol.

Which application layer protocol is used to support electronic mail?

SMTP.

What is true about HTTP connections?

HTTP connection can be both persistent and non-persistent.

In the ISO/OSI stack, what is the layer number of the application layer?

7.

What is the function of the DNS server?

To manage top-level domain queries.

What information does an ICMP message contain when reporting an error?

Type, code, and the full payload of the IP datagram.

Which protocol maps IP addresses to MAC addresses in a LAN?

ARP.

What is the application layer protocol to download an email?

POP.

What is the purpose of the TCP three-way handshake?

To establish a connection and set connection parameters.

What happens when a frame with errors is detected at the link layer?

It is dropped or retransmitted.

Which HTTP method is used to delete resources using RESTful web service?

DELETE.

What is true when discussing TDMA?

Time is divided into equal size slots.

Which protocol supports electronic mail?

SMTP.

What is the goal operation of the NETCONF protocol?

Manage and configure devices network-wide.

What does the acronym VLAN stand for?

Virtual Local Area Network.

What is true about cookies in web communication?

They are used to maintain some state between transactions.

In IPv4 addressing, how many networks are allowed under Class A addresses?

2^24.

How does a switch handle a frame with an unknown destination MAC address?

It broadcasts the frame on all interfaces.

What is the primary goal of Network Address Translation (NAT)?

Allow multiple devices to share a single public IP address.

What is the primary purpose of multiplexing in the transport layer?

To handle data from multiple sockets for transmission.

What is the main function of the link layer?

Transferring data between adjacent nodes.

What is true when talking about polling MAC protocols?

Access to channel in 'rounds'.

What is the role of the sequence number in TCP?

Identifies the order of segments.

What is the main drawback of pure ALOHA?

High probability of collisions.

What is the function of the ARP table in a host?

Stores mapping of IP addresses to MAC addresses.

What is true about simple mode communication?

Communication is unidirectional.

What does 'cumulative acknowledgment' refer to in TCP?

Acknowledging all segments up to a specific sequence number.

What is the operation of a switch when it receives a frame with an unknown destination MAC?

It broadcasts the frame on all interfaces except the one it arrived on.

What happens if a TCP segment is lost during transmission?

The sender retransmits after a timeout.

What is the primary goal of Dijkstra's algorithm?

Calculate the least-cost path from a source node to all other nodes.

What field in a TCP header is used for flow control?

Receive window.

What technology is used for network management?

YANG.

What is the difference between MAC and IP addresses?

MAC addresses are unique to devices, while IP addresses depend on location.

What is true about HTTP?

Clients always initiate TCP connections.

What happens if a frame with errors is detected at the link layer?

It is dropped or retransmitted.

What is the main purpose of Dijkstra's algorithm?

Calculate the least-cost path.

What is true when talking about multicast communication?

One or more senders and one or more recipients participate.

Which HTTP status code means the request was not understood?

400 Bad Request.

Which protocol transitions from IPv4 to IPv6?

Tunneling.

What is a key definition of bandwidth?

Amount of data transmitted in a fixed amount of time.

What does the term 'Hot Potato Routing' refer to?

A routing strategy based on the lowest intra-AS cost.

What is true when discussing simplex mode?

Communication is unidirectional.

What is the role of the checksum in a UDP segment?

To detect errors in the transmitted segment.

How long is the checksum field in bits?

16.

What is true about direct broadcast communication?

It appends 255.255.255.255 in the destination header.

What is the TCP sequence number?

Byte stream number of the first byte in segment's data.

What application layer protocol is used for sending emails?

SMTP.

What is true about client-server architecture?

Computers have distinct roles, with servers providing resources.

What information does a DNS server manage?

Top-level domain queries.

What is the layer number of the transport layer in ISO/OSI?

4.

What is true about direct limited broadcast?

Reserves the address for sending to many recipients.

In which layer does a switch operate?

Link layer.

What technique is used to transition from IPv4 to IPv6 networks?

Tunneling.

What is the primary purpose of multiplexing in transport layer?

To handle data from multiple sockets.

What is the result if the queue buffer is full?

The packet is dropped.

What is true about half-duplex communication?

Only one device can transmit at a time.

What is true about direct limited broadcast?

This allows the transfer of data from a single client to all devices.

What does an ICMP message include when reporting an error?

Type, code, and the full payload of the IP datagram.

What does the acronym POP stand for?

Post Office Protocol.

What is true about the application layer protocol SMTP?

It is used for sending emails.

What is accomplished through Network Address Translation (NAT)?

Sharing a single public IP across multiple devices.

What does the term 'cumulative acknowledgment' refer to in TCP?

Acknowledging all segments up to a specific sequence number.

What does 'unicast' refer to in networking?

Transfers data from one sender to one receiver.

What is true about cookies?

They store state information between transactions.

What is the layer number of the network layer in ISO/OSI?

3.