单项选择题
A. tracking tagged items across an enterprise
B. access to enterprise networks from different service areas
C. standards-based communications for multiple media types
D. extensive functionality for large enterprises
多项选择题 WhataretwobenefitsoftheCisco1800SeriesIntegratedServicesRouters？（）
单项选择题 Becauseofthesystems-levelapproach，Ciscosecuritycandefendagainstwidespreadattacks fromhackersandviruses.WhatdescribestheCisconetworksecuritystrategy？（）
多项选择题 Whichtwoseriesofrouterscanintegratesecurityservices，enablewirelessnetworking，and simplifynetworkmanagement？（）