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NEW QUESTION: 1
Why do large OSPF networks use a hierarchical design? (Choose three.)
A. to reduce routing overhead
B. to lower costs by replacing routers with distribution layer switches
C. to speed up convergence
D. to confine network instability to single areas of the network
E. to reduce the complexity of router configuration
F. to decrease latency by increasing bandwidth
Answer: A,C,D

NEW QUESTION: 2

A. Option D
B. Option A
C. Option C
D. Option B
E. Option E
Answer: D

NEW QUESTION: 3
The network administrator has been asked to give reasons for moving from IPv4 to IPv6. What are two valid reasons for adopting IPv6 over IPv4? (Choose two.)
A. autoconfig
B. Telnet access does not require a password
C. change of source address in the IPv6 header
D. NAT
E. no broadcast
F. change of destination address in the IPv6 header
Answer: A,E
Explanation:
Explanation/Reference:
Six Benefits Of IPv6
Reference:
http://www.networkcomputing.com/ipv6/six-benefits-of-ipv6/230500009
Explanation:
With IPv6, everything from appliances to automobiles can be interconnected. But an increased number of IT addresses isn't the only advantage of IPv6 over IPv4. In honor of World IPv6 Day, here are six more good reasons to make sure your hardware, software, and services support IPv6.
More Efficient Routing
IPv6 reduces the size of routing tables and makes routing more efficient and hierarchical. IPv6 allows ISPs to aggregate the prefixes of their customers' networks into a single prefix and announce this one prefix to the IPv6 Internet. In addition, in IPv6 networks, fragmentation is handled by the source device, rather than the router, using a protocol for discovery of the path's maximum transmission unit (MTU).
More Efficient Packet Processing
IPv6's simplified packet header makes packet processing more efficient. Compared with IPv4, IPv6 contains no IP-level checksum, so the checksum does not need to be recalculated at every router hop.
Getting rid of the IP-level checksum was possible because most link-layer technologies already contain checksum and error-control capabilities. In addition, most transport layers, which handle end-to-end connectivity, have a checksum that enables error detection.
Directed Data Flows
IPv6 supports multicast rather than broadcast. Multicast allows bandwidth-intensive packet flows (like multimedia streams) to be sent to multiple destinations simultaneously, saving network bandwidth.
Disinterested hosts no longer must process broadcast packets. In addition, the IPv6 header has a new field, named Flow Label, that can identify packets belonging to the same flow.
Simplified Network Configuration
Address auto-configuration (address assignment) is built in to IPv6. A router will send the prefix of the local link in its router advertisements. A host can generate its own IP address by appending its link- layer (MAC) address, converted into Extended Universal Identifier (EUI) 64-bit format, to the 64 bits of the local link prefix.
Support For New Services
By eliminating Network Address Translation (NAT), true end-to-end connectivity at the IP layer is restored, enabling new and valuable services. Peer-to-peer networks are easier to create and maintain, and services such as VoIP and Quality of Service (QoS) become more robust.
Security
IPSec, which provides confidentiality, authentication and data integrity, is baked into in IPv6. Because of their potential to carry malware, IPv4 ICMP packets are often blocked by corporate firewalls, but ICMPv6, the implementation of the Internet Control Message Protocol for IPv6, may be permitted because IPSec can be applied to the ICMPv6 packets.

NEW QUESTION: 4
Your network contains an Active Directory domain named contoso.com.
You run nslookup.exe as shown in the following Command Prompt window:

You need to ensure that you can use Nslookup to list all of the service location (SRV) resource records for contoso.com.
What should you modify?
A. the Windows Firewall settings on the DNS server
B. the root hints of the DNS server
C. the security settings of the zone
D. the zone transfer settings of the zone
Answer: D
Explanation:
http://www.c3.hu/docs/oreilly/tcpip/dnsbind/ch11_07.htm
11.7 Troubleshooting nslookup Problems
11.7.4 Query Refused
Refused queries can cause problems at startup, and they can cause lookup failures during a session. Here's what it looks like when nslookup exits on startup because of a refused query:
% nslookup
*** Can't find server name for address 192.249.249.3: Query refused
*** Default servers are not available
%
This one has two possible causes. Either your name server does not support inverse queries (older nslookups only), or zone security is stopping the lookup.
Zone security is not limited to causing nslookup to fail to start up. It can also cause lookups and zone transfers to fail in the middle of a session when you point nslookup to a remote name server. This is what you will see:
% nslookup
Default Server:
hp.com
Address:
15.255.152.4
> server terminator.movie.edu
Default Server:
terminator.movie.edu
Address:
192.249.249.3
> carrie.movie.edu.
Server:
terminator.movie.edu
Address:
192.249.249.3
*** terminator.movie.edu can't find carrie.movie.edu.: Query refused
> ls movie.edu - This attempts a zone transfer
[terminator.movie.edu]
*** Can't list domain movie.edu: Query refused
>