What are the dangerous consequences of a poorly chosen time to live (ttl)?

Best Answers.

LESSON 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.

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.

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.

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.

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.

LESSON 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.

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.

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’s IP address.

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.

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

Lesson 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.

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.

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.

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’s root name servers

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.