Top 25 Access Control List ACL Interview Questions and Answers

When Alice desires to send data to Bob the first step is a route lookup. Thus the route to Bob is the default route (assuming Router A is configured as such). While the modern internet primarily uses the TCP/IP model, the OSI model is still widely used as a conceptual model for understanding the flow of data communications. When this layer receives frames from the data link layer, it changes them to a bitstream. We use IP for communication between different networks (to address and transport data from one network to another). It performs the role of routing, i.e., searches for the fastest route to pass a data packet. An IP address is a logical address – this means that it is allocated depending on which network the device has been connected to.

IP Address Allocation Methods

Layer 6 of the OSI model is named the presentation layer and is responsible for character code translation (i.e. ASCII vs. EBCDIC vs. Unicode), data conversion, compression, and encryption. Some common examples include Multipurpose Internet Mail Extensions (MIME), Transport Layer Security (TLS) and Secure Sockets Layer (SSL). The Open Systems Interconnection reference model has been an essential element of computer network design since its ratification in 1984.

Step 2: Implement VLSM subnetting for the largest network (LAN A)

PAT uses unique source port numbers on the Inside
Global IP address to distinguish between translations. Because the
port number is encoded in 16 bits, the total number could
theoretically be as high as 65,536 per IP address. If you use PAT you could argue that it is working at layer 4 as well because it MIGHT change the source port of the packet in case it is not unique. Let’s not forget that OSI became a successful result of an attempt to standardize a network language.

  • Use simple and straightforward access control lists whenever possible.
  • Today, there are many different kinds of firewalls and ACL substitutes.
  • If you manage a network with multiple devices and hosts, you know how important it is to assign and manage IP addresses and subnets efficiently and accurately.
  • To track your lost cell phone or locate a person, you may have to use other services.
  • Frames that are sent without a VLAN tag are called untagged frames.

For example, it can be used to detect and prevent unauthorized access to systems or networks. Geolocation data can also be used to identify and track potential cyber threats, such as phishing attacks or malware infections. Inaccurate or incomplete geolocation data can hinder these efforts and make it more challenging to protect against cyber attacks It is, therefore, essential to use a variety of geolocation methods, including IP addresses, to ensure that accurate location data is obtained. Yes, there are legal regulations in place to protect location privacy, although they vary by jurisdiction.