NTC 324 Week 3 Best Answer

NTC 324 Week 3 Best Answer Chapter 10

1. What is the primary reason IPv6 has not completely replaced IPv4?
a. Administrators are hesitant and reluctant to change.
b. Stopgap technologies such as Network Address Translation (NAT) and Classless
Inter-Domain Routing (CIDR) alleviate the lack of registered IPv4 addresses.
c. IPv4 addresses have only been depleted since early 2011.
d. IPv6 has already replaced IPv4 on the Internet.

Explanation: There have been several calls to action for organizations to plan actively for the widespread deployment of the new version of the basic Internet Protocol, IPv6, which is designed to supplement and eventually replace the 25-year-old IPv4 protocol. The Internet Society strongly supports such calls for action.
If deployment is delayed, the future growth and global connectivity of the Internet will be negatively impacted. The information below is intended to assist in answering some of the frequently asked questions associated with exhaustion of the IPv4 address pool and the adoption of IPv6
2. What is the primary difference between a NAT server and a proxy server?
a. There is no difference; they are functionally the same.
b. There is little difference because NAT servers and proxy servers; both act as an intermediary
between networks.
c. Proxy servers offer additional functions such as they can scan, cache, and filter certain
types of data.
d. NAT servers translate at the Network layer of the protocol stack, whereas proxy servers
function at the Application layer.

Explanation: The difference between NAT and proxies is under the hood; in how they are performed.
NAT is an acronym for "Network Address Translation." Traditionally NAT is done by routers and firewalls. On the vast majority of networks the IP addresses given to computers are not publicly routable. This means that computers which share a network can talk to each other directly; however to talk to the Internet their local IP addresses must be "translated," to a publicly routable address. Traditionally this is done by a router or firewall. The router/firewall has one or more publicly routable addresses, which the whole Internet can direct communications to. It also has a local address on the inside network, a network which it shares with its PCs and other devices. When a PC makes a request out to the Internet, it's directed to the router/firewall. The router/firewall changes the source IP address of the packets to its public IP address, notes the connection request in its memory, and sends them on their way on the Internet. When a response is received, the router looks up the connection in its memory, and this time changes the destination address from the public IP to the local IP of the machine which initiated communications. It then sends the packet on its way on the inside network. On Linux this is referred to as "source" NAT. Cisco calls it "dynamic" NAT.

3. Your company environment includes Windows Server versions 2003, 2008, and 2012.
Desktops range from Windows XP and Vista. To transition to IPv6, what versions have
IPv6 support running by default?
a. Windows Server 2008, Windows Server 2012, and Vista have IPv6 running by
default.
b. All versions have IPv6 running by default, except the Windows 2003 servers.
c. Windows Server 2003 and Windows XP both include support for IPv6, but they do
not install it by default.
d. Only Windows Server 2012 has IPv6 running by default.

Explanation: Windows server 2008,windows server 2012 Vista have IPv6 running by default. These versions should have IPv6 in their systems.

4. What Windows Server 2012 services and applications offer IPv6 support?
a. Nearly all server roles provide IPv6 support.
b. Few offer IPv6 support, but they are expected soon.
c. All offer IPv6 support in Windows Server 2012.
d. Remote Access supports IPv6 routing and advertising, and the DHCP Server role can
allocate IPv6 addresses.

Explanation: Since IPv6 was fully introduced in Windows Server 2008 and Windows Vista, Microsoft has been working to support this next generation Internet protocol.
The tables below provide a summary view of the IPv6 support status of various products and services from Microsoft. Where available, links to additional information about the support state of the products have been included.

5. What is Intra-Site Automatic Tunnel Addressing Protocol (ISATAP)?
a. ISATAP converts IPv4 address for an IPv6 network just as 6to4 offers.
b. ISATAP emulates an IPv6 link for use on an IPv4 network.
c. ISATAP is a method of multicasting for IPv6 networks.
d. ISATAP translates between IPv4 and IPv6 networks without client configuration
Explanation: ISATAP (Intra-Site Automatic Tunnel Addressing Protocol) is an IPv6 transition mechanism meant to transmit IPv6 packets between dual-stack nodes on top of an IPv4 network
Chapter 11
1. One method a Dynamic Host Configuration Protocol (DHCP) server allocates IP
addresses is called manual allocation. This process involves manually assigning an IP
address to a particular server. What is the key benefit of DHCP manual allocation over
manually configuring the address directly on the server?
a. The DHCP server then contains a centralized list of permanently assigned addresses.
b. The DHCP server might pass on more information than just an IP address.
c. This process prevents accidental duplication of permanently assigned IP addresses.
d. This manually assigned address is officially known as a reservation.

Explanation: Duplication of permanently assigned IP address in this process will prevent accidental duplication.



2. Your DHCP servers are burdened with heavy traffic, most related to IP address renewals.
Unfortunately, virtually all the IP addresses in each of your subnets are allocated. Which
of the following options is the best way to lower the renewal traffic?
a. Increase the lease time.
b. Deploy additional DHCP servers on the most burdened subnets.
c. Shorten the lease time.
d. Switch to manual allocation.
Explanation: Your DHCP servers are burdened with heavy traffic, most related to IP address renewals. Unfortunately, virtually all the IP addresses in each of your subnets are allocated because it increases the lease time which is helpful



3. You are preparing to deploy Windows 8 to a large number of new workstations. Which
of the following options would be best?
a. Install Windows 8 using Pre-boot Execution Environment (PXE) and Windows
Deployment Services (WDS).
b. Delegate the work to a team of local administrators to divide up.
c. Manually install the operating system yourself.
d. Manually configure each workstation- IP address.

Explanation: Use of Pre-boot Execution Environment and windows Deployment Service will be the best.


4. To make use of Pre-boot Execution Environment (PXE) and Windows Deployment
Services (WDS), what special configuration do you require on the server and client?
a. The client must have a special PXE-enabled network adapter.
b. Both client and server are capable by default.
c. The client and server both require some preparatory configuration.
d. The DHCP server on the network must have a custom PXEClient option (option 60)
configured with the location of the WDS server on the network

Explanation: The Preboot Execution Environment (PXE) is an industry standard client/server interface that allows networked computers that are not yet loaded with an operating system to be configured and booted remotely by an administrator. 
.
5. What servers should not be DHCP clients?
a. Web servers, DHCP servers, and domain controllers
b. Workstations
c. End user laptops
d. Computers, which might have IP addresses in the exclusion range

Explanation: A DHCP server can only service requests for a scope whose network ID is the same as the network ID of its IP address.

Chapter 12
1. What client applications utilize Domain Name System (DNS) to resolve host names into
IP addresses?
a. Client web browsers, or any application that uses HyperText Transfer Protocol
(HTTP) use DNS to resolve host names into IP addresses.
b. All Internet applications working with host names must use DNS to resolve host
names into IP addresses.
c. Any application on a system that has connectivity to the Internet use DNS to resolve
host names into IP addresses.
d. DNS does not resolve host names into IP addresses.

Explanation: 1)	The Domain Name System (DNS) is a hierarchical distributed naming system for computers, services, or any resource connected to the Internet or a private network. It associates various information with domain names assigned to each of the participating entities. Most prominently, it translates domain names, which can be easily memorized by humans, to the numerical IP addresses needed for the purpose of computer services and devices worldwide.


2. What is the primary purpose of name caching?
a. Name caching saves extraordinary amount of time for the user.
b. Name caching greatly reduces traffic on the company network.
c. Name caching validates why you should deploy caching-only servers.
d. Name caching enables the second name resolution request for the same name to
bypass the referral process.

Explanation: A name server is a computer hardware or software server that implements a network service for providing responses to queries against a directory service. It translates an often humanly-meaningful, text-based identifier to a system-internal, often numeric identification or addressing component. This service is performed by the server in response to a service protocol request.


3. What are the dangerous consequences of a poorly chosen Time To Live (TTL)?
a. Specifying a TTL that is too long can greatly increase traffic, especially to the root
name and top-level domain servers.
b. Specifying a TTL that is too long can delay referrals from being propagated.
c. Specifying a TTL that is too short can overburden root name and top-level domain
servers with requests.
d. Specifying a TTL that is too short can cause incorrectly cached information to
remain before changes get recorded.

Explanation: Specifying a TTL that is too short can overburden root name and top-level domain servers with requests because It can over burden the network and will specify the time to live.

4. What is the primary benefit of a DNS forwarder?
a. Exchanging iterative queries for recursive queries across the network perimeter
b. Reducing the traffic and making efficient use of available bandwidth across the
network perimeter
c. Making the most of iterative queries to other DNS servers
d. Reducing the burden on the Internet- root name servers
Explanation: 4)	DNS forwarding is the process by which particular sets of DNS queries are handled by a designated server, rather than being handled by the initial server contacted by the client. Usually, all DNS servers that handle address resolution within the network are configured to forward requests for addresses that are outside the network to a dedicated forwarder.


5. What are some best practices when creating internal DNS namespaces.
a. Avoid an excessive number of domain levels.
b. Keep domain names full and descriptive; avoid concise subdomains.
c. Place less importance on a convention compared to spelling.
d. Never abbreviate.
Explanation: Best practices when creating internal DNS name spaces. Is that Excessive number of domain level should be avoided as it avoids any kind of problems.