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A developer has created a new image to use in a Docker build and has added a tag for the image by using the command:
$ docker tag 84fe411926287 local/app:0.4
Which command must be executed next to build the Docker image using the tag?
The docker build command is used to build an image from a Dockerfile. The -t option tags the image with a specified name and tag.
Tagging: The docker tag command associates an image ID with a repository and tag.
Building with Tag: The correct command to build the Docker image and tag it as local/app:0.4 is docker build -t local/app:0.4.
Option D is the correct command to build and tag the image.
Docker Documentation: Docker Build Reference
Refer to the exhibit.
What do all the calls shown in the sequence diagram have in common?
In the provided sequence diagram, each call must complete before the next one can proceed, indicating that the calls are synchronous. Synchronous calls block further execution until the response is received, maintaining a sequential order of operations.
Synchronous Nature: The diagram shows each function call being made and then waiting for a callback before proceeding to the next step.
Blocking Behavior: Each interaction completes fully before the next one starts, which is characteristic of synchronous operations.
Option C correctly identifies that all the calls shown in the sequence diagram are synchronous.
Cisco DevNet Documentation: Sequence Diagrams and Synchronous Communication
Which HTTP response code should be returned when the request is completed, but there is no content to send for the request?
The HTTP response code 204 No Content indicates that the server successfully processed the request, but there is no content to send in the response. This status code is typically used when a request is successfully handled, but no additional information needs to be returned to the client.
Cisco DevNet Associate Study Guide: HTTP Status Codes (Chapter 7, Section: Common HTTP Response Codes).
Refer to the exhibit.
Which two statements about the network diagram are true? (Choose two.)
Statement B: One of the routers has two connected serial interfaces.
This statement is true if the diagram indicates that a router has two serial interfaces. In network diagrams, routers often have multiple interfaces to connect different segments or other routers, particularly for WAN connections.
Statement E: The subnet address of PC-B has 18 bits dedicated to the network portion.
If PC-B's subnet is represented by an address such as 192.168.x.x/18, then 18 bits are used for the network portion, leaving 14 bits for host addresses. This aligns with standard subnetting practices where a /18 subnet mask means the first 18 bits define the network, and the remaining bits define host addresses.
For example, a subnet mask of 255.255.192.0 corresponds to /18 in CIDR notation, indicating that the first 18 bits are for the network portion.
Incorrect Statements:
Statement A: PC-A and PC-B are in the same subnet.
This statement can be evaluated based on the IP addresses and subnet masks provided for PC-A and PC-B. If they share the same network portion of their addresses and subnet masks, then they are in the same subnet. However, without explicit addresses, this cannot be verified.
Statement C: The subnet of PC-C can contain 256 hosts.
For a subnet to contain 256 hosts, it would need a /24 subnet mask (255.255.255.0), which provides 256 IP addresses (254 usable for hosts). The subnet mask should be examined to determine the validity of this statement.
Statement D: R1 and R3 are in the same subnet.
This depends on the IP addresses and subnet masks assigned to the interfaces on R1 and R3. If they are within the same network range, then they would be in the same subnet.
Since the network diagram is not provided, the verification is based on common networking principles and standard practices in subnetting. For detailed and accurate confirmation, the exact IP addresses, subnet masks, and interface connections need to be reviewed.
What is a benefit of using a code review process in application development?
A code review process involves evaluating and examining another developer's code to identify potential issues, bugs, and improvements before the code is merged into the main codebase. It helps in maintaining code quality and catching errors early in the development cycle.
Error Detection: Code reviews help detect and eliminate common mistakes and bugs that developers might overlook.
Knowledge Sharing: They promote knowledge sharing and learning among team members.
Code Quality: Ensures that the code adheres to the coding standards and best practices.
Option D is correct as the primary benefit of code reviews is to eliminate common mistakes during development.
Cisco DevNet Documentation: Best Practices for Code Reviews
