CCENT/CCNA ICND1 Official Exam Certification Guide - Chapter 13

Operating Cisco Routers Bộ định tuyến khác nhau từ các thiết bị chuyển mạch về mục đích cốt lõi của họ. Thiết bị chuyển mạch Ethernet khung hình bằng cách so sánh địa chỉ MAC đích của khung bảng địa chỉ MAC của switch, trong khi các bộ định tuyến chuyển tiếp các gói bằng cách so sánh địa chỉ IP đích để bảng định tuyến IP của router. Chuyển mạch Ethernet hiện nay thường chỉ có một hoặc nhiều loại giao diện Ethernet, trong khi các bộ định tuyến có giao diện Ethernet, giao diện WAN nối tiếp,...
Nội dung trích xuất từ tài liệu:
CCENT/CCNA ICND1 Official Exam Certification Guide - Chapter 13 1828xbook.fm Page 399 Thursday, July 26, 2007 3:10 PM 13 CHAPTER Operating Cisco Routers Routers differ from switches in terms of their core purposes. Switches forward Ethernet frames by comparing the frame’s destination MAC address to the switch’s MAC address table, whereas routers forward packets by comparing the destination IP address to the router’s IP routing table. Ethernet switches today typically have only one or more types of Ethernet interfaces, whereas routers have Ethernet interfaces, serial WAN interfaces, and other interfaces with which to connect via cable and digital subscriber line (DSL) to the Internet. Routers understand how to forward data to devices connected to these different types of interfaces, whereas Ethernet switches focus solely on forwarding Ethernet frames to Ethernet devices. So, while both switches and routers forward data, the details of what can be forwarded, and to what devices, differ significantly. Even though their core purposes differ, Cisco routers and switches use the same CLI. This chapter covers the CLI features on routers that differ from the features on switches, particularly features that differ from the switch CLI features as covered in Chapter 8. This chapter also explains more details about the physical installation of Cisco routers, along with some details about how routers choose and load IOS. “Do I Know This Already?” Quiz The “Do I Know This Already?” quiz allows you to assess if you should read the entire chapter. If you miss no more than one of these nine self-assessment questions, you might want to move ahead to the “Exam Preparation Tasks” section. Table 13-1 lists the major headings in this chapter and the “Do I Know This Already?” quiz questions covering the material in those headings so you can assess your knowledge of these specific areas. The answers to the “Do I Know This Already?” quiz appear in Appendix A. “Do I Know This Already?” Foundation Topics Section-to-Question Mapping Table 13-1 Foundation Topics Section Questions Installing Cisco Routers 1, 2 Cisco Router IOS CLI 3–7 Upgrading Cisco IOS Software and the Cisco IOS Software Boot Process 8, 9 1828xbook.fm Page 400 Thursday, July 26, 2007 3:10 PM 400 Chapter 13: Operating Cisco Routers Which of the following installation steps are typically required on a Cisco router, but 1. not typically required on a Cisco switch? Connect Ethernet cables a. Connect serial cables b. Connect to the console port c. Connect the power cable d. Turn the on/off switch to “on” e. Which of the following roles does a SOHO router typically play in regards to 2. IP address assignment? DHCP server on the interface connected to the ISP a. DHCP server on the interface connected to the PCs at the home/office b. DHCP client on the interface connected to the ISP c. DHCP client on the interface connected to the PCs at the home/office d. Which of the following features would you typically expect to be associated with the 3. router CLI, but not with the switch CLI? The clock rate command a. The ip address address mask command b. The ip address dhcp command c. The interface vlan 1 command d. You just bought two Cisco routers for use in a lab, connecting each router to a different 4. LAN switch with their Fa0/0 interfaces. You also connected the two routers’ serial interfaces using a back-to-back cable. Which of the following steps is not required to be able to forward IP on both routers’ interfaces? Configuring an IP address on each router’s FastEthernet and serial interfaces a. Configuring the bandwidth command on one router’s serial interface b. Configuring the cloc ...