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[多选] Which three IP multicast address related statements are true? (Choose three.) () 

A . Multicast addresses 224.0.0.0 through 224.0.0.255 are always forwarded because they are transmitted  with Time to Live (TTL) greater than 1.
B . Multicast addresses 224.0.0.5 and 224.0.0.6 are source multicast addresses for OSPF routers.
C . Multicast addresses 224.0.0.13 and 224.0.0.22 are reserved link-local addresses used by PIMv2 and  IGMPv3.
D . Because they would map to overlapping IP multicast MAC addresses, multicast addresses 224.0.1.1  and 238.1.1.1 could not be used together.
E . Multicast address 224.0.1.1 has been reserved for the Network Time Protocol (NTP) by the IANA
F . The administratively scoped multicast addresses 239.0.0.0 through 239.255.255.255 are similar in  purpose to RFC 1918 private unicast addresses.

现代教学手段在教学中具有怎样的作用? 运输大巷 To troubleshoot network issues more accurately, milliseconds should be included in the syslog of the router. Which command will achieve this?() service timestamps log datetimec msec。 logging timestamps msec。 syslog timestamps hour minute second miliseconds。 service logging timestamp msec。 logging service timestamp msec。 内隐联想测验方法 DHCP snooping on Cisco Nexus 1000V Series Switches acts like a firewall between untrusted hosts and trusted DHCP servers by doing which of these? ()  validates DHCP messages received from untrusted sources and filters out invalid response messages from DHCP servers。  intercepts all ARP requests and responses on untrusted ports。  builds and maintains the DHCP snooping binding database, which contains information about untrusted hosts with leased IP addresses。  uses the DHCP snooping binding database to validate subsequent requests from untrusted hosts。  limits IP traffic on an interface to only those sources that have an IP-MAC address binding table entry or static IP source entry。 Which three IP multicast address related statements are true? (Choose three.) () 
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