Page 1 of 44
CS6250 COMPUTER NETWORKS 2026 EXAM 1
COMPLETE (71) CURRENT TESTING
QUESTIONS AND DETAILED CORRECT
ANSWERS|GUARANTEED PASS.
COMPUTER NETWORKS
Prepare effectively with this CS6250 Computer Networks Exam
1, designed to assess foundational knowledge of computer
networking concepts. It focuses on network architecture,
protocols, data transmission, and core communication models.
The exam strengthens analytical thinking and problem-solving
skills in networking systems. Suitable for computer science and
IT students.
What is the Open Shortest Path First (OSPF) protocol? ✓ ✓
...... ANSWER ....... Open Shortest Path First (OSPF) is a
routing protocol which uses a link state routing algorithm to
find the best path between the source and the destination
router.
It is a link-state protocol that uses flooding of link-state
information and a Dijkstra least-cost path algorithm.
Advances include authentication of messages exchanged
between routers, the option to use multiple same cost
, Page 2 of 44
paths, and support for hierarchy within a single routing
domain.
How does a router process advertisements? ✓ ✓ ......
ANSWER ....... The router consists of a route processor
(which is the main processing unit) and interface cards that
receive data packets which are forwarded via a switching
fabric. Let us break down router processing in a few steps:
1. Initially, the LS update packets which contain LSAs from a
neighboring router reaches the current router's OSPF (which
is the route processor). This is the first trigger for the route
processor. As the LS Updates reach the router, a consistent
view of the topology is being formed and this information is
stored in the link-state database. Entries of LSAs correspond
to the topology which is actually visible from the current
router.
2. Using this information from the link-state database, the
current router calculates the shortest path using the
shortest path first (SPF) algorithm. The result of this step is
fed to the Forwarding Information Base (FIB)
3. The information in the FIB is used when a data packet
arrives at an interface card of the router, where the next hop
for the packet is decided and its forwarded to the outgoing
interface card.
, Page 3 of 44
What is hot potato routing? ✓ ✓ ...... ANSWER ....... Hot
potato routing is a technique/practice of choosing a path
within the network, by choosing the closest egress
point(network exit) based on intra domain path cost (Interior
Gateway Protocol/IGP cost).
Hot potato routing simplifies computations for the routers as
they are already aware of the IGP path costs. It makes sure
that the path remains consistent, since the next router in the
path will also choose to send the packet to the same egress
point.
Hot potato routing also effectively reduces the network's
resource consumption by getting the traffic out as soon as
possible.
● Describe the relationships between ISPs, IXPs, and CDNs.
✓ ✓ ...... ANSWER ....... The Internet is a complex
ecosystem. It is built with a network of networks. These
networks include (ISPs) Internet Service Providers, (IXPs)
Internet Exchange Points, (CDNs) Content Delivery
Networks. In 2019, there were apx. 500 IXPs around the
world.
, Page 4 of 44
large scale Tier-1 ISPs that operate at a global scale, and
essentially they form the "backbone" network over which
smaller networks can connect
IXPs are interconnection infrastructures, which provide the
physical infrastructure, where multiple networks (eg ISPs
and CDNs) can interconnect and exchange traffic locally.
CDNs are networks that are created by content providers
with the goal of having greater control of how the content is
delivered to the end-users, and also to reduce connectivity
costs. Some example CDNs include Google and Netflix.
These networks have multiple data centers - and each one of
them may be housing hundreds of servers - that are
distributed across the world.
● What is an AS? ✓ ✓ ...... ANSWER ....... AS stands for
autonomous systems. ISPs, IXPs and CDNs can all operate
as an AS. An AS is a group of routers including the links
among them that operate under the same administrative
authority.
CS6250 COMPUTER NETWORKS 2026 EXAM 1
COMPLETE (71) CURRENT TESTING
QUESTIONS AND DETAILED CORRECT
ANSWERS|GUARANTEED PASS.
COMPUTER NETWORKS
Prepare effectively with this CS6250 Computer Networks Exam
1, designed to assess foundational knowledge of computer
networking concepts. It focuses on network architecture,
protocols, data transmission, and core communication models.
The exam strengthens analytical thinking and problem-solving
skills in networking systems. Suitable for computer science and
IT students.
What is the Open Shortest Path First (OSPF) protocol? ✓ ✓
...... ANSWER ....... Open Shortest Path First (OSPF) is a
routing protocol which uses a link state routing algorithm to
find the best path between the source and the destination
router.
It is a link-state protocol that uses flooding of link-state
information and a Dijkstra least-cost path algorithm.
Advances include authentication of messages exchanged
between routers, the option to use multiple same cost
, Page 2 of 44
paths, and support for hierarchy within a single routing
domain.
How does a router process advertisements? ✓ ✓ ......
ANSWER ....... The router consists of a route processor
(which is the main processing unit) and interface cards that
receive data packets which are forwarded via a switching
fabric. Let us break down router processing in a few steps:
1. Initially, the LS update packets which contain LSAs from a
neighboring router reaches the current router's OSPF (which
is the route processor). This is the first trigger for the route
processor. As the LS Updates reach the router, a consistent
view of the topology is being formed and this information is
stored in the link-state database. Entries of LSAs correspond
to the topology which is actually visible from the current
router.
2. Using this information from the link-state database, the
current router calculates the shortest path using the
shortest path first (SPF) algorithm. The result of this step is
fed to the Forwarding Information Base (FIB)
3. The information in the FIB is used when a data packet
arrives at an interface card of the router, where the next hop
for the packet is decided and its forwarded to the outgoing
interface card.
, Page 3 of 44
What is hot potato routing? ✓ ✓ ...... ANSWER ....... Hot
potato routing is a technique/practice of choosing a path
within the network, by choosing the closest egress
point(network exit) based on intra domain path cost (Interior
Gateway Protocol/IGP cost).
Hot potato routing simplifies computations for the routers as
they are already aware of the IGP path costs. It makes sure
that the path remains consistent, since the next router in the
path will also choose to send the packet to the same egress
point.
Hot potato routing also effectively reduces the network's
resource consumption by getting the traffic out as soon as
possible.
● Describe the relationships between ISPs, IXPs, and CDNs.
✓ ✓ ...... ANSWER ....... The Internet is a complex
ecosystem. It is built with a network of networks. These
networks include (ISPs) Internet Service Providers, (IXPs)
Internet Exchange Points, (CDNs) Content Delivery
Networks. In 2019, there were apx. 500 IXPs around the
world.
, Page 4 of 44
large scale Tier-1 ISPs that operate at a global scale, and
essentially they form the "backbone" network over which
smaller networks can connect
IXPs are interconnection infrastructures, which provide the
physical infrastructure, where multiple networks (eg ISPs
and CDNs) can interconnect and exchange traffic locally.
CDNs are networks that are created by content providers
with the goal of having greater control of how the content is
delivered to the end-users, and also to reduce connectivity
costs. Some example CDNs include Google and Netflix.
These networks have multiple data centers - and each one of
them may be housing hundreds of servers - that are
distributed across the world.
● What is an AS? ✓ ✓ ...... ANSWER ....... AS stands for
autonomous systems. ISPs, IXPs and CDNs can all operate
as an AS. An AS is a group of routers including the links
among them that operate under the same administrative
authority.
