CS6250 COMPUTER NETWORKS EXAM
1 2025 UPDATE/PRACTICE
QUESTIONS AND CORRECT VERIFIED
ANSWERS (complete
solutions)ASSURED
SUCCESS/GRADED A+!!!
(Lesson 12) There are several factors that can make
a CDN network unreliable, such as misconfigured
routers, power outages, malicious attacks or natural
disasters. (T/F) - __100% correct answer as
True
(Lesson 12) The network topology of ISPs has
become flatter over time, and the number of
Internet Exchange Points (IXPs) has increased. (T/F)
- __100% correct answer as True
,(Lesson 12) The major drawback of the "Enter
Deep" approach is that, if one server is lost, that
geographic area will experience a higher delay and
lower throughput. (T/F) - __100% correct
answer as False
(Lesson 12) When using CDN servers for content
delivery, there is more overhead than when using
the traditional approach. (T/F) - __100% correct
answer as True
(Lesson 12) For a CDN to deliver content to an
Internet user, the system randomly selects a server
from a cluster, and then it maps that server to a
client. (T/F) - __100% correct answer as
False
(Lesson 12) Picking the geographically closest
cluster location for a user is always the best choice
,in terms of performance for content delivery. (T/F) -
__100% correct answer as False
(Lesson 12) When utilizing consistent hashing for
server selection, in the event of a server failure, the
responsibility for managing the objects originally
handled by the failed server is transferred to a
randomly chosen server within the same ID space.
(T/F) - __100% correct answer as False
(Lesson 12) When using DNS caching, what would
happen if a host A makes a request for a domain
that was just previously queried by another host?
1. The local DNS server will send the request to the
appropriate DNS server to fetch the IP address.
2. The local DNS server will immediately answer the
host with the IP address.
, 3. The request will be forward to the root servers
first.
4. None of the above. - __100% correct
answer as 2. The local DNS server will
immediately answer the host with the IP address.
(Lesson 12) What is the purpose of an NS record in
DNS?
1. To translate domain names in IP addresses
2. To specify the mail server responsible for
accepting email messages on behalf of the domain.
3. To redirect one domain to another domain.
1 2025 UPDATE/PRACTICE
QUESTIONS AND CORRECT VERIFIED
ANSWERS (complete
solutions)ASSURED
SUCCESS/GRADED A+!!!
(Lesson 12) There are several factors that can make
a CDN network unreliable, such as misconfigured
routers, power outages, malicious attacks or natural
disasters. (T/F) - __100% correct answer as
True
(Lesson 12) The network topology of ISPs has
become flatter over time, and the number of
Internet Exchange Points (IXPs) has increased. (T/F)
- __100% correct answer as True
,(Lesson 12) The major drawback of the "Enter
Deep" approach is that, if one server is lost, that
geographic area will experience a higher delay and
lower throughput. (T/F) - __100% correct
answer as False
(Lesson 12) When using CDN servers for content
delivery, there is more overhead than when using
the traditional approach. (T/F) - __100% correct
answer as True
(Lesson 12) For a CDN to deliver content to an
Internet user, the system randomly selects a server
from a cluster, and then it maps that server to a
client. (T/F) - __100% correct answer as
False
(Lesson 12) Picking the geographically closest
cluster location for a user is always the best choice
,in terms of performance for content delivery. (T/F) -
__100% correct answer as False
(Lesson 12) When utilizing consistent hashing for
server selection, in the event of a server failure, the
responsibility for managing the objects originally
handled by the failed server is transferred to a
randomly chosen server within the same ID space.
(T/F) - __100% correct answer as False
(Lesson 12) When using DNS caching, what would
happen if a host A makes a request for a domain
that was just previously queried by another host?
1. The local DNS server will send the request to the
appropriate DNS server to fetch the IP address.
2. The local DNS server will immediately answer the
host with the IP address.
, 3. The request will be forward to the root servers
first.
4. None of the above. - __100% correct
answer as 2. The local DNS server will
immediately answer the host with the IP address.
(Lesson 12) What is the purpose of an NS record in
DNS?
1. To translate domain names in IP addresses
2. To specify the mail server responsible for
accepting email messages on behalf of the domain.
3. To redirect one domain to another domain.
