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NEW QUESTION: 1
You have a DNS server named Server1 that runs Windows Server 2003 Service Pack 2 (SP2).
Server1 is a stand alone server.
You perform a full backup of Server1 every day.
A DNS zone on Server1 is deleted by using the DNS snap in.
You need to restore the DNS zone on Server1.
What should you do?
A. Restore all files in the %systemroot%\DNS folder.
B. Copy all files from the %systemroot%\DNS\Backup folder to the %systemroot%\DNS folder.
C. Restore all files in the %systemroot%\System32\drivers\etc folder.
D. Restore the system state data.
Answer: D

NEW QUESTION: 2
What are the advantages of VoLTE/SRVCC? (Multiple choice)
A. Seamlessly inherit all the services provided by the original CS network, including general services such as emergency calls and monitoring and regulatory services.
B. Implement end-to-end QoS control to ensure voice call quality
C. Fully retain the user's logo (MSISDN, etc.), and continue to tap business profit by using the operator's number resources.
D. Deploy and develop an IMS network, involving more new or modified network elements
E. Since the voice is carried on the IP, the IMS can be used to enhance more rich media services for users and compete with OTT.
Answer: A,B,C,E

NEW QUESTION: 3
Which three features are considered part of the IPv6 first-hop security suite? (Choose three.)
A. DNS guard
B. ICMP guard
C. DoS guard
D. DHCP guard
E. RA guard
F. destination guard
Answer: D,E,F
Explanation:
Cisco IOS has (at least) these IPv6 first-hop security features: IPv6 RA Guard rejects fake RA messages coming from host (non-router) ports (not sure whether it handles all possible IPv6 header fragmentation attacks). Interestingly, it can also validate the contents of RA messages (configuration flags, list of prefixes) received through router-facing ports, potentially giving you a safeguard against an attack of fat fingers. DHCPv6 Guard blocks DHCPv6 messages coming from unauthorized DHCPv6 servers and relays. Like IPv6 RA Guard it also validates the DHCPv6 replies coming from authorized DHCPv6 servers, potentially providing protection against DHCPv6 server misconfiguration. IPv6 Snooping and device tracking builds a IPv6 First-Hop Security Binding Table (nicer name for ND table) by monitoring DHCPv6 and ND messages as well as regular IPv6 traffic. The binding table can be used to stop ND spoofing (in IPv4 world we'd call this feature DHCP Snooping and Dynamic ARP Inspection). IPv6 Source Guard uses the IPv6 First-Hop Security Binding Table to drop traffic from unknown sources or bogus IPv6 addresses not in the binding table. The switch also tries to recover from lost address information, querying DHCPv6 server or using IPv6 neighbor discovery to verify the source IPv6 address after dropping the offending packet(s). IPv6 Prefix Guard is denies illegal off-subnet traffic. It uses information gleaned from RA messages and IA_PD option of DHCPv6 replies (delegated prefixes) to build the table of valid prefixes. IPv6 Destination Guard drops IPv6 traffic sent to directly connected destination addresses not in IPv6 First-Hop Security Binding Table, effectively stopping ND exhaustion attacks.
Reference. http://blog.ipspace.net/2013/07/first-hop-ipv6-security-features-in.html