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NEW QUESTION: 1
Which of the following is the protocol data unit (PDU) of application layer in TCP/IP model?
A. Packet
B. Data
C. Frame
D. Segment
Answer: B
Explanation:
Explanation/Reference:
Application layer's PDU is data.
For your exam you should know below information about TCP/IP model:
Network models
Layer 4. Application Layer
Application layer is the top most layer of four layer TCP/IP model. Application layer is present on the top of the Transport layer. Application layer defines TCP/IP application protocols and how host programs interface with Transport layer services to use the network.
Application layer includes all the higher-level protocols like DNS (Domain Naming System), HTTP (Hypertext Transfer Protocol), Telnet, SSH, FTP (File Transfer Protocol), TFTP (Trivial File Transfer Protocol), SNMP (Simple Network Management Protocol), SMTP (Simple Mail Transfer Protocol) , DHCP (Dynamic Host Configuration Protocol), X Windows, RDP (Remote Desktop Protocol) etc.
Layer 3. Transport Layer
Transport Layer is the third layer of the four layer TCP/IP model. The position of the Transport layer is between Application layer and Internet layer. The purpose of Transport layer is to permit devices on the source and destination hosts to carry on a conversation. Transport layer defines the level of service and status of the connection used when transporting data.
The main protocols included at Transport layer are TCP (Transmission Control Protocol) and UDP (User Datagram Protocol).
Layer 2. Internet Layer
Internet Layer is the second layer of the four layer TCP/IP model. The position of Internet layer is between Network Access Layer and Transport layer. Internet layer pack data into data packets known as IP datagram's, which contain source and destination address (logical address or IP address) information that is used to forward the datagram's between hosts and across networks. The Internet layer is also responsible for routing of IP datagram's.
Packet switching network depends upon a connectionless internetwork layer. This layer is known as Internet layer. Its job is to allow hosts to insert packets into any network and have them to deliver independently to the destination. At the destination side data packets may appear in a different order than they were sent. It is the job of the higher layers to rearrange them in order to deliver them to proper network applications operating at the Application layer.
The main protocols included at Internet layer are IP (Internet Protocol), ICMP (Internet Control Message Protocol), ARP (Address Resolution Protocol), RARP (Reverse Address Resolution Protocol) and IGMP (Internet Group Management Protocol).
Layer 1. Network Access Layer
Network Access Layer is the first layer of the four layer TCP/IP model. Network Access Layer defines details of how data is physically sent through the network, including how bits are electrically or optically signaled by hardware devices that interface directly with a network medium, such as coaxial cable, optical fiber, or twisted pair copper wire.
The protocols included in Network Access Layer are Ethernet, Token Ring, FDDI, X.25, Frame Relay etc.
The most popular LAN architecture among those listed above is Ethernet. Ethernet uses an Access Method called CSMA/CD (Carrier Sense Multiple Access/Collision Detection) to access the media, when Ethernet operates in a shared media. An Access Method determines how a host will place data on the medium.
IN CSMA/CD Access Method, every host has equal access to the medium and can place data on the wire when the wire is free from network traffic. When a host wants to place data on the wire, it will check the wire to find whether another host is already using the medium. If there is traffic already in the medium, the host will wait and if there is no traffic, it will place the data in the medium. But, if two systems place data on the medium at the same instance, they will collide with each other, destroying the data. If the data is destroyed during transmission, the data will need to be retransmitted. After collision, each host will wait for a small interval of time and again the data will be retransmitted.
Protocol Data Unit (PDU) :
Protocol Data Unit - PDU
The following answers are incorrect:
Segment - Transport layer PDU
Packet - Network interface layer PDU
Frame/bit - LAN or WAN interface layer PDU
The following reference(s) were/was used to create this question:
CISA review manual 2014 page number 272
NEW QUESTION: 2
The NetScaler processes HTTP/2 web client connections to the backend web servers by
_________. (Choose the correct option to complete the sentence.)
A. Passing- through all HTTP/2 traffic to the web servers.
B. Converting the HTTP/2 headers to HTTP/1.1 headers and forwarding them to the web servers.
C. Dropping HTTP/2 requests as it is NOT supported by web servers.
D. Converting HTTP/2 to HTTP 0.9 and forwarding the packets to the web servers.
Answer: B
NEW QUESTION: 3
What is a characteristic of EMC Atmos?
A. Provides source-based deduplication
B. Consolidates block, file, and object accesses in one solution
C. Provides compute, storage, network, and virtualization products in one solution
D. Supports storage multitenancy
Answer: D
Explanation:
EMC Atmos EMC Atmos supports object-based storage for unstructured data, such as pictures and videos. Atmos combines massive scalability with specialized intelligence to address the cost, distribution, and management challenges associated with vast amounts of unstructured data.
Atmos can be deployed in two ways: as a purpose-built hardware appliance or as software in VMware environments, where Atmos VE can leverage the existing servers and storage. The hardware appliance is comprised of servers (nodes) connected to standard disk enclosures.
The rack includes a 24-port Gigabit Ethernet switch to provide internode communication. The Atmos software is installed on each node.
Atmos VE enables users to exploit the power of Atmos in a virtualized environment. It can be deployed on a virtual machine in VMware ESXi hosts and configured with the VMware certified back-end storage.
Following are the key features offered by EMC Atmos:
Policy-based management: EMC Atmos improves operational efficiency by automatically distributing content based on business policy. The administrator-defined policies dictate how, when, and where the information resides.
Protection: Atmos offers two options to protect the objects, replication and Geo Parity: Replication ensures that the content is available and accessible by creating redundant copies of an object at multiple designated locations.
Geo Parity ensures that the content is available and accessible by dividing objects into
multiple segments plus parity segments and distributing them to one or more designated
locations.
Data services: EMC Atmos includes the data services, such as, compression, and
deduplication. These features are native to Atmos and can be managed and accessed via
a policy.
Web services and legacy protocols: EMC Atmos provides flexible web services access
(REST/SOAP) for web-scale applications and file access (CIFS/NFS/Installable File
System/Centera API) for traditional applications.
Automated system management: EMC Atmos provides auto-configuring, auto-managing,
and auto-healing capabilities to reduce administration and downtime.
Multitenancy: EMC Atmos enables multiple applications to be served from the same
infrastructure. Each application is securely partitioned and cannot access the other
application's data. Multitenancy is ideal for service providers or large enterprises that want
to provide cloud computing services to multiple customers or departments allowing logical
and secure separation within a single infrastructure.
Flexible administration: EMC Atmos can be managed via a graphical user interface (GUI)
or command line interface (CLI).
EMC E10-001 Student Resource Guide. Module 8: Object-based and Unified Storage