Networking Concepts Review

These flashcards cover key concepts from networking and OSI/ISO models to prepare for exams.

What command in Linux can display the routing table?

route, netstat or route lp.

Is there a session layer in the Internet model?

No.

Select protocols from the seventh layer of the ISO/OSI model:

HTTP, SMTP, FTP, POP3.

What are the main differences between datagram networks and virtual channel networks?

In a network with virtual channels, routers must maintain state for each virtual channel that passes through the router +
In a datagram network, each packet may transmit along a different path +

What are the sources of packet delay in the third layer?

Transmission delay, , checksum checking, waiting in queue.

What port does Telnet work on by default?

Port 23.

Does a DNS server provide an answer in a recursive query if it doesn't know the requested address translation?

No.

What does the ICMP "Destination Unreachable" packet indicate?

The computer we are trying to contact has a closed port.

Which functions are handled by TCP?

Congestion control, flow control, Fair sharing of bandwidth +

What is the Window mechanism used for?

For congestion control and In the TCP protocol

Does the TCP protocol dynamically change the transmission speed?

Yes.

What is the correct expansion of SMTP?

Simple Mail Transfer Protocol.

12. Check the end-to-end congestion control features:

Terminal systems identify congestion on the basis of losses and delays +

Terminal systems identify congestion on the basis of losses alone
The network layer does not report congestion information at the transport layer

Is there an Internet layer in the OSI/ISO model

No.

At the link layer, we talk about:

Frames.

Does a stateless protocol maintain information on an ongoing connection?

No.

What services does the Internet provide for applications?

Reliable connection service and unreliable connectionless service.

What are the sources of packet delay?

Propagation delay, processing at nodes, waiting in queue, transmission delay.

What is the broadcast address for the IP address 213.23.10.34/23?

213.23.11.255.

How many bits does an IPv4 address have?

32 bits.

What is the network address for the IP address 192.23.11.23/23?

192.23.10.0/23.

Which addresses are created after dividing the network 172.16.32.0/24 into the 4th subnet?

172.16.32.0/26, 172.16.32.64/26, 172.16.32.128/26, 172.16.32.192/26.

Do techniques like CIDR and NAT allow for more efficient use of IPv4 addresses?

Yes.

24. Techniques: CIDR (Classless Inter-Domain Routing) and NAT (Network Address Translation) allow for more efficient use of IPv4 addresses

yes

How many bits does an IPv6 address have?

128 bits.

Is OSPF a link state routing protocol?

Yes.

Do dynamic routing protocols react to network topology changes?

No.

What are examples of computer network topologies?

Star, ring, and rail.

Replacing hubs with switches increases the number of what?

Collision domains.

Is PPP a second-layer protocol?

Yes.

How many layers are there in the classic OSI model?

Seven layers.

What does polling refer to in networking?

The network device polls other devices for a transmission request.

What is the theoretical speed of a 10BASE-T network?

10 Mb/s.

Layer 2 of the OSI model consists of:

MAC(Media Access Control) and LLC(Logical Link Control)

What are the two basic types of packet switching modes?

Cut-through and store-and-forward.

What is 10BASE2?

A standard defining cabling for Ethernet that uses a thin coaxial cable. and allows 10 Mbps

In 10BASE-T, what is the maximum cable length?

100 m.

What is a switch?

A network device that forwards frames based on the destination address.

What happens when you replace a hub with a switch in a network?

●        The maximum possible distance between nodes will be reduced +

●        By reducing the number of collisions, the number of lost frames will decrease +

What does the MAC address signify?

Standard data link layer address required for each device connected to the LAN.

How is the application layer of the OSI model implemented?

Software.

Is MAC addressing hierarchical?

No.

What does WAN stand for?

Wide Area Network.

What topology does a Token Ring work with?

Ring topology.

What device is an amplifier (repeater)?

None,given

What is the first layer of the OSI model implemented with?

Hardware.

What is the maximum theoretical data transfer rate for 802.11b?

11 Mb/s.

What layer does IPSec provide security for?

Network layer.

What does integrity mean in networking?

It is not possible to modify a message without warning.

What does the SSL protocol provide?

Authentication, integrity, and confidentiality.

When is confidentiality preserved?

When only the right recipient can understand the message.

What can Trojan horses be used for?

Sending spam, eavesdropping on passwords, and blocking access to services.

What is the correct expansion of TCP?

Transmission Control Protocol.

What command can check the configuration of network interfaces in Linux?

ifconfig.

Do protocols control the sending/receiving of information?

No.

What is the network classification that splits all networks into two groups?

Packet networks.,
●        Networks based on switching channels +

Which routing protocols are used within autonomous systems?

OSPF, RIP, IS-IS,

What does TTL define?

How many devices a packet can be sent through.

What does the Ethernet standard define in frame structure?

Synchronizing the receiver.

What occurs in an Ethernet 100BaseT when using only a switch?

The node can transmit and receive at full speed.
●        Collisions do not occur, but frames can be lost due to buffer overflows or frame damage +

Does the switch need an IP address for proper operation?

No.

What does ARP do?

Translates between IP and MAC addresses.

What plug terminates UTP cable used in Ethernet 100BaseT technology?

RJ-45.

How many bits does the IP address have?

32 bits.

What kind of encoding does Ethernet 10BaseT use?

Manchester.

What does hybrid cryptography refer to?

None of the above answers is correct.

What is the correct expansion of the POP3 acronym?

Post Office Protocol version 3.

Select the protocols from the application layer 7 of the OSI/ISO model.

FTP, HTTP, POP3, SMTP.

Does a state protocol maintain information about an ongoing connection?

Yes.

What does the dynamic configuration protocol for host IP addresses called?

DHCP (Dynamic Host Configuration Protocol)     +

What do you mean by asynchronous multiplexing?

Bandwidth distribution without using a fixed time pattern.