CPSC 335

What is the primary goal of Software Defined Networking (SDN)?

To separate the control plane from the data plane, enabling more flexible and efficient network management.

How do SDNs differ from traditional networking approaches?

allow centralized management of network resources and programmable network behavior, unlike traditional networking which relies on static, hardware-based configurations.

What analogy was used to explain SDNs in class?

The analogy of navigation, where traditional routing is like following fixed maps while SDNs provide dynamic rerouting based on real-time data.

What does the fragmentation offset in an IPv4 datagram indicate?

It indicates the position or order of the fragment within the original datagram.

What does TTL stand for in IPv4 datagram format?

Time to Live, which determines the lifetime of the packet in the network to prevent looping.

What are flags in an IPv4 datagram?

Control bits that indicate whether the packet can be fragmented and if it is the last fragment.

What is the source IP address in an IPv4 datagram?

The IP address of the device that sends the packet.

What is a switching fabric?

A hardware architecture that enables data to be transferred between input and output ports in a network.

How many types of switching fabrics are there?

There are several types including shared memory, crossbar, and input/output queued switching fabrics.

What is the purpose of a subnet?

To divide a larger network into smaller, manageable segments to improve performance and security.

What is the primary goal of DHCP?

To dynamically assign IP addresses and other network configuration parameters to devices on a network.

What is NAT?

Network Address Translation, a method used to translate private IP addresses into a public IP address and vice versa.

How does NAT help with network security?

By masking internal IP addresses, NAT provides a layer of security against external threats.

What is one primary difference between IPv4 and IPv6?

IPv6 has a larger address space compared to IPv4, allowing for more devices to be connected to the internet.

What is network management?

The process of administering and managing various network resources to ensure efficient operation and security.

How are routing algorithms important in a network

Routing algorithms determine the optimal path for data transmission in a network, ensuring efficient data delivery and reducing congestion.

What is the difference between global and decentralized routing information?

Global routing information provides a complete view of the network, while decentralized routing allows each router to make decisions based on local information.

What are three services of the link layer?

Framing, error detection and correction, and media access control.

Link layer- Framing

is the process of encapsulating network layer packets into frames for transmission over the physical layer. It ensures that data packets are correctly identified and organized.

Link layer- Error detection

is a technique used to identify and correct errors that may occur during the transmission of frames over a network. It allows the receiver to detect corrupted data and request retransmission if necessary.

Link layer- Media access control

is a protocol that determines how data is transmitted over a shared medium in a network. It manages access to the physical transmission medium to avoid collisions and ensure efficient communication between devices.