From the Development Layers, we know that ______.

Which line from the output of the show ip interface command indicates a layer 1 problem?（）

As a frame leaves a Layer 3 device, the Layer 2 encapsulation information is changed from what it was when it entered the devicE.For what two reasons can this happen? （）

You download a file from an FTP site on the Internet. What is the highest layer in the OSI model used in this FTP operation?（）

You are the network consultant from Cisco.com. Please point out which Layer 2 access designs does not support VLAN extensions?（）

Which is the most accurate statement regarding the business requirements development service component in the prepare phase. Select exactly 1 answer（s） from the following：（）。

Assuming that an IP packet is sent from a source address in VLAN1 to a destination address in VLAN2 through a layer-3 switch, which part of the packet will be changed?（）

If an enterprise customer required A switch for their branch office access layer, which family of switches would the customer likely choose from?（）

Your developers have asked you to restore the development database， which is in NOARCHIVELOG mode， back to last Tuesday the 20th. Your last backup is from Monday the 19th. What do you do？（）

As a frame leaves a Layer 3 device，the Layer 2 encapsulation information is changed from what it was when it entered the device. For what two reasons can this happen？（）

Which definition best describes the staging plan development service component within the design phase？ Select exactly 1 answer（s） from the following：（）。

You are the network consultant from Cisco.com. Please point out the reason that STP required when VLANs do not span access layer switches.（）

What benefit results from implementation of Layer 3 switching versus Layer 2 switching in a fully meshed campus network？（）

If an enterprise customer required a switch for their branch office access layer, which family of switches would the customer likely choose from?（）

Linguists distinguish three periods of English based on its development, among which the Middle English period is often considered lasts from ________.

听力原文：W: To sum up, the successful birth and development of "Dolly" showed that a life could start with cells taken from adult animals. OK, any questions？

The professor mentions a theory that people migrating from the Sahara were important to the development of the Egyptian civilization. Which sentence best describes the professors attitude toward this theory？

As a reflection of Hester Prynne's moral development, the scarlet letter A symbolically undergoes a gradual and imperceptible change from _______ to "able" and last to "angel".

For decades, Americans have taken for granted the United States’ leadership position in the development of new technologies. The innovations (创新) that resulted from research and development during World War II and afterwards were 36 to the prosperity of the nation in the second half of the 20th century. Those innovations, upon which virtually all aspects of 37 society now depend, were possible because the United States then 38 the world in mathematics and science education. Today, however, despite increasing demand for workers with strong skills in mathematics and science, the 39 of degrees awarded in science, math, and engineering are decreasing.

The miracle silicon chip represents a development in the technology of mankind that over the past few years has acquired the force and significance associated with the development of hand tools or the discovery of the steam engine. Just as the Industrial Revolution took over an immense range of tasks from men's muscles and enormously expanded productivity, so the microcomputer is rapidly assuming huge burdens of tedious work from the human brain and thereby expanding the mind's capacities in ways that man has only begun to grasp. With the chip, remarkable achievements of memory and execution become possible in everything from farms to banks to corporate offices.

听力原文：Man: The interesting part of the job is the staff development side - arranging training and organising appraisals. And we're doing more of that because more training time is necessary to keep staff up-to-date with computer applications. It's nice to do this as a change from the routine of advertising, interviewing, drawing up staff contracts, etc.

Xiamen is well—known as“Hawaii in the East”with colorful view and rich folk culture．It has attracted many tourists from around the world．Since the l990s，tourism(旅游业)in Xiamen has gained an unexpected development，with a great number of visitors each year coming to enjoy the variety and beauty that this sea—side

The vision of education for ______ development is a world where everyone has the opportunity to benefit from quality education and learn the values, behavior. and lifestyles required for a ______ future and for positive societal transformation.

While troubleshooting connectivity issues, you log into a remote router. From there,you wish to see the layer 1 and layer 2 status of the interface.Which of the following IOS commands would you issue to check the current IP addressing, as well as theyer 1 and layer 2 status of an interface？（）

Together with the network layer,the transport layer is the heart of the protocol （）.The network layer provides end-to-end （） delivery using datagrams or virtual circuits.The transport layer builds on