Question 1.
The default DHCP lease renewal time values are:
(Choose 2)
| a) |
Unicast to granting server -- 66.7% (2/3) of the lease duration |
| b) |
Broadcast to any server -- 93.75% (15/16) of the lease duration |
| c) |
Unicast to granting server -- 50% (1/2) of the lease duration |
| d) |
Broadcast to any server -- 87.5% (7/8) of the lease duration |
Answer
Question 2.
In the Domain Name System, which of the following are correct?
(Choose 2)
| a) |
a gTLD is a government Top Level Domain. |
| b) |
a ccTLD is a country-specific Top Level Domain. |
| c) |
a gTLD is a generic Top Level Domain. |
| d) |
a ccTLD is a corporate/commercial Top Level Domain. |
Answer
Question 3.
What is the primary reason for the difficulty in establishing redundant DHCP servers?
| a) |
The DHCP message structure leads to a database structure that precludes data exchange among servers. |
| b) |
Clients are confused by replies from multiple servers and fail to choose a response to accept. |
| c) |
DHCP is sufficiently robust as a protocol that redundancy is not required. |
| d) |
DHCP servers do not report on the addresses they have leased. |
Answer
Answers
Question 1.
The default DHCP lease renewal time values are:
(Choose 2)
| a) |
Unicast to granting server -- 66.7% (2/3) of the lease duration |
| b) |
Broadcast to any server -- 93.75% (15/16) of the lease duration |
| c) |
Unicast to granting server -- 50% (1/2) of the lease duration |
| d) |
Broadcast to any server -- 87.5% (7/8) of the lease duration |
Answer
| c) |
Unicast to granting server -- 50% (1/2) of the lease duration |
| d) |
Broadcast to any server -- 87.5% (7/8) of the lease duration |
Explanation
The default values for clients to begin attempting to renew their leases are 50% of lease duration for a unicast request to the granting server and 87.5% of lease duration for a broadcast to any DHCP server (if the granting server has not replied). These times are known as T1 and T2, respectively.
[5036]
Question 2.
In the Domain Name System, which of the following are correct?
(Choose 2)
| a) |
a gTLD is a government Top Level Domain. |
| b) |
a ccTLD is a country-specific Top Level Domain. |
| c) |
a gTLD is a generic Top Level Domain. |
| d) |
a ccTLD is a corporate/commercial Top Level Domain. |
Answer
| b) |
a ccTLD is a country-specific Top Level Domain. |
| c) |
a gTLD is a generic Top Level Domain. |
Explanation
gTLDs are the generic Top Level Domains, such as com, edu, biz, mil, etc. They often (but not always) have no nationality association (gov is exclusive to the U.S. government, and mil is exclusive to the U.S. armed forces). ccTLDs are the country code TLDs; they are two-letter designators for a domain specific to a nation-state -- ru for Russia, de for Germany (Deutschland), etc.
[5016]
Question 3.
What is the primary reason for the difficulty in establishing redundant DHCP servers?
| a) |
The DHCP message structure leads to a database structure that precludes data exchange among servers. |
| b) |
Clients are confused by replies from multiple servers and fail to choose a response to accept. |
| c) |
DHCP is sufficiently robust as a protocol that redundancy is not required. |
| d) |
DHCP servers do not report on the addresses they have leased. |
Answer
| d) |
DHCP servers do not report on the addresses they have leased. |
Explanation
DHCP servers do not exchange any information regarding addresses they have leased. This makes redundancy difficult, since redundant servers may therefore not draw from the same address pool (lest they inadvertently both lease the same address to different hosts). The DHC Working Group has expended considerable effort on the problem, but since there is no way to distinguish a down server from a down communications link, loss of contact does not free any address leased by the other and whose lease has (possibly) expired. One solution has been to give the redundant servers different scopes within the block of addresses available in the network design, which eliminates having to worry about conflicting assignments.
[5039]
[IE-DNS-SQ1-F04]
[2002-11-27-01]
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