Free Practice Questions for Oracle 1z0-822 Exam

* DiffServ uses the 6-bit Differentiated services Field (DS field) in the IP header for packet classification purposes.

* In the Diffserv model, the marker marks a packet with a value that reflects a forwarding behavior. Marking is the process of placing a value in the packet's header to indicate how to forward the packet to the network. IPQoS contains two marker modules:

/ dscpmk – Marks the DS field in an IP packet header with a numeric value that is called the Differentiated Services codepoint, or DSCP. A Diffserv-aware router can then use the DS codepoint to apply the appropriate forwarding behavior to the packet.

/ dlcosmk – Marks the virtual local area network (VLAN) tag of an Ethernet frame header with a numeric value that is called the user priority. The user priority indicates the class of service (CoS), which defines the appropriate forwarding behavior to be applied to the datagram.

Note:

* Differentiated services or DiffServ is a computer networking architecture that specifies a simple, scalable and coarse-grained mechanism for classifying and managing network traffic and providing quality of service (QoS) on modern IP networks. DiffServ can, for example, be used to provide low-latency to critical network traffic such as voice or streaming media while providing simple best-effort service to non-critical services such as web traffic or file transfers.

* IPQoS, included in Solaris, includes the following modules, which are part of the Differentiated Services (Diffserv) architecture that is defined in RFC 2475:

Classifier

Meter

Marker

IPQoS adds the following enhancements to the Diffserv model:

Flow-accounting module

802.1D datagram marker

Not on compression setting:

compression=on | off | lzjb | gzip | gzip-N

Controls the compression algorithm used for this dataset. The

"lzjb" compression algorithm is optimized for performance while

providing decent data compression. Setting compression to "on" uses

the "lzjb" compression algorithm.

Incorrect:

Not A, Not E: Should not use commas like this.

Not B, Not D: There is no property algorithm named to this command. To specify the use of the lzjb compression command we must use compression=lzjb.

Example:

The default service model is contract, but may be modified. For this example, we are going to start the service with svc.startd. As a transient service, it will be started once and not restarted by adding the following lines to the manifest:

/>

Note:

svc.startd provides three models of service, which are

* Transient services—These are often configuration services, which require no long-running processes to provide service. Common transient services take care of boot-time cleanup or load configuration properties into the kernel. Transient services are also sometimes used to overcome difficulties in conforming to the method requirements for contract or wait services. This is not recommended and should be considered a stopgap measure.

* Contract services—These are the standard system daemons. They require processes which run forever once started to provide service. Death of all processes in a contract service is considered a service error, which will cause the service to restart.

* Wait services—These services run for the lifetime of the child process, and are restarted when that process exits.

The capped-memory resource sets limits for physical, swap, and locked memory. Each limit is optional, but at least one must be set.

Dump Parameter: minimum free space

Minimum amount of free space required in the savecoredirectory after

saving crash dump files. If no minimum free space has been configured, the

default is one Mbyte.

All interfaces in the same group must have the same STREAMS modules configured in the same order.

* pkgrecv

- Image Packaging System content retrieval utility

pkgrecv allows the user to retrieve packages from a pkg repository or package archive. pkgrecv can also optionally republish the retrieved packages to a different package repository or archive them.

-s src_repo_uri

A URI representing the location of a pkg repository or package archive from which to receive package data.

-d path_or_uri

The file system path or URI of the target to republish packages to. If -a is specified, the target is a new package archive that cannot already exist. Otherwise, the target must be a package repository that already exists. New repositories can be created using pkgrepo(1).

Profiles are, in many ways, similar to manifests in that they use the same XML DTD. However, instead of providing information about a service, its dependencies, and methods, a profile is used to provide customization of a service or an instance of a service. Customizations include whether an instance of a service should be enabled or disabled and any modifications to service configuration properties.

Incorrect:

Not A: Manifests (not profiles) are used to describe services and instances of a service, including any property groups and properties they might have.