Tài liệu trắc nghiệm về công nghệ thông tin | 1. Which OSI layer does IP rely on to determine whether packets have been lost and to request retransmission U application U presentation E session K transport 2. Refer to the exhibit. Which layered network model is shown in the diagram Cisco IETF OSI E TCP IP 3. Refer to the exhibit. The diagram represents the process of sending e-mail between clients. Which list correctly identifies the component or protocol used at each numbered stage of the diagram 1 K 4. A user enters http in the address line of a browser. Which statement is true about this transaction E The http portion indicates the protocol that is being used. The webl .htm portion is the specific service name. The retrieved web page will be displayed in URL code. The is the name of the web page file that is called. 5. Which range of port numbers are reserved for services that are commonly used by applications that run on servers 0 to 255 E 0 to 1023 1024 to 49151 49152 to 65535 6. Which OSI layer addressing is required to route packets between two networks E Layer 1 E Layer 2 E Layer 3 E Layer 4 7. When connectionless protocols are implemented at the lower layers of the OSI model what is usually used to acknowledge that the data was received and to request the retransmission of missing data E IP E UDP E Ethernet E a connectionless acknowledgement E an upper-layer connection-oriented protocol or service 8. Which statement is true about Layer 3 addresses E They are physical addresses. E They are used in routing decisions. E They are only used on local networks. 2 They are altered each time a packet crosses a router. 9. Which option shows the PDU .
