CCENT Cisco Certified Entry Networking Technician Study Guide: (ICND1 Exam 640-822), 2nd Edition

Chapter 2: Internet Protocols

1. A, D, E, G. To send mail, the protocol SMTP is used at the Application layer. SMTP uses TCP at the Transport layer to create a reliable virtual circuit. IP is used at the Network layer to provide routing, and Ethernet is the typical Network Access (LAN) connection type. Although ARP can be used at the Network layer, it is not mandatory because the destination MAC address may already be known.
2. C. Proxy ARP can help machines on a subnet reach remote subnets without configuring routing or a default gateway.
3. C. Dynamic Host Configuration Protocol (DHCP) is used to provide IP information to hosts on your network. DHCP can provide a lot of information, but the most common is IP address, subnet mask, default gateway, and ...