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How many DNS root servers are there?


A) 1.
B) 2.
C) 10.
D) 13.
E) DNS does not use root servers.

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Client PCs need additional software to use basic SSL-TLS functions.

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In tunnel mode,IPsec provides protection ________.


A) all the way between the two hosts
B) only between the IPsec servers
C) Both A and B
D) Neither A nor B

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In SNMP,the ________ creates traps.


A) manager
B) agent
C) Both A and B
D) Neither A nor B

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Which mode of IPsec is more expensive?


A) Transport mode.
B) Tunnel mode.
C) Both A and B are equally expensive.

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Which of the following is a private IP address range?


A) 10.x.x.x
B) 128.171.x.x
C) Both A and B
D) Neither A nor B

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DHCP ________ are configurable parameters that determine which subnets the DHCP server will serve.


A) ranges
B) scopes
C) spans

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In SNMP,the manager communicates directly with a(n) ________.


A) managed device
B) agent
C) Both A and B
D) Neither A nor B

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Which of the following is true about NAT?


A) It can enhance security.
B) It presents problems for some protocols.
C) Both A and B
D) Neither A nor B

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In the Domain Name System,there is a single root server.

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In transport mode,IPsec provides security over the internal networks.

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SSL-TLS provides central policy management.

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IPsec is used for ________ VPNs.


A) remote-access
B) site-to-site
C) Both A and B
D) Neither A nor B

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IPsec protects all layers above the internet layer.

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In IP subnet planning,you need to have at least 130 subnets.How large should your subnet part be?


A) 6.
B) 8.
C) 14.
D) 16.
E) None of the above.

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In SNMP,the agent can create commands.

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SNMPv3 uses ________ for authentication.


A) community names
B) digital certificates and digital signatures
C) a different password for each manager-agent pair
D) All of the above.

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SSL-TLS only provides protection to SSL-TLS-aware applications.

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Clients can send a DHCP request message to multiple DHCP servers.

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Directory servers organize information in a ________.


A) ring
B) mesh
C) hierarchy
D) relational database
E) Any of the above can be used.

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