单项选择题
In order to allow the establishment of a Telnet session with a router, which set of commands must be configured?（）
A.A B.B C.C D.D E.E F.F
Whiletroubleshootinganetworkconnectivityproblem,atechni...
单项选择题While troubleshooting a network connectivity problem, a technician observes steady link lights on both the workstation NIC and the switch port to which the workstation is connected. However, when the ping command is issued from the workstation, the output message "Request timed out." is displayed. At which layer of the OSI model does the problem most likely exist?（）
A.the session layer B.the protocol layer C.the data link layer D.the access layer E.the network layer F.the application layer
WhichtwovaluesareusedbySpanningTreeProtocoltoelectaroot...
多项选择题Which two values are used by Spanning Tree Protocol to elect a root bridge? (Choose two.)（）。
A.amount of RAM B.bridge priority C.IOS version D.IP address E.MAC address F.speed of the links
IntheimplementationofVLSMtechniquesonanetworkusingasing...
单项选择题In the implementation of VLSM techniques on a network using a single Class C IP address, which subnet mask is the most efficient for point-to-point serial links? （）
A.255.255.255.0 B.255.255.255.240 C.255.255.255.248 D.255.255.255.252 E.255.255.255.254
