CS6250 COMPUTER NETWORK EXAM 2
EXAM STUDY GUIDE ACTUAL TESTED
QUESTIONS AND CORRECT ANSWERS
VERIFIED
⩥ Main Challenges with BGP.
Answer: Misconfigurations and faults.
A misconfiguration can result in an excessively large number of
updates which in turn can result in route instability, router
processor and memory overloading, outages, and router failures.
IXP stands for Internet Exchange Point.
They provide physical infrastructure for ASes to interconnect
and directly exchange traffic with each other.
,The physical infrastructure of an IXP is usually a network of
switches that are located either in the same physical location, or
they can be distributed over a region or even at a global scale.
Typically, the infrastructure has fully redundant switching fabric
that provides fault-tolerance, and the equipment is usually
located in facilities such as data centers to provide reliability,
sufficient power and physical security.
⩥ IXP.
Answer: Physical infrastructures that provide the means for
ASes to interconnect and directly exchange traffic with one
another.
The ASes that interconnect at an ____ are called participant
ASes.
The physical infrastructure of an ____ is usually a network of
switches that are located either in the same physical location, or
they can be distributed over a region or even at a global scale.
⩥ Four reasons for IXPs increased popularity.
,Answer: 1. IXPs are large interconnection hubs handling large
traffic volumes. Some large IXPs handle as much traffic as Tier
1 ISPs
2. They play an important role in mitigating DDoS attacks
3. The "real world" infrastructures provide an excellent research
playground for multiple applications
4. IXPs are active marketplaces and technology innovation hubs.
They are providing new services beyond interconnection like
DDoS mitigation or SDN-based services
⩥ IXP Services.
Answer: 1. Public Peering
2. Private Peering
3. Route Servers and Service Level Agreements (SLAs)
4. Remote peering through resellers
, 5. Mobile Peering
6. DDoS Blackholing
7. Free value-add services: Extra things for the "good of the
internet" like Consumer broadband tests, DNS root name servers
and distribution of local time through NTP
⩥ Route Server.
Answer: ● Collects and shares routing information from its
peers or participants that connects with (i.e. IXP members that
connect to the RS).
● Executes its own BGP decision process and also re-advertise
the resulting information (I.e. best route selection) to all RS's
peer routers.
● Also known as Multi-lateral BGP peer sessions.
⩥ Router basic components.
Answer: - Input Ports
EXAM STUDY GUIDE ACTUAL TESTED
QUESTIONS AND CORRECT ANSWERS
VERIFIED
⩥ Main Challenges with BGP.
Answer: Misconfigurations and faults.
A misconfiguration can result in an excessively large number of
updates which in turn can result in route instability, router
processor and memory overloading, outages, and router failures.
IXP stands for Internet Exchange Point.
They provide physical infrastructure for ASes to interconnect
and directly exchange traffic with each other.
,The physical infrastructure of an IXP is usually a network of
switches that are located either in the same physical location, or
they can be distributed over a region or even at a global scale.
Typically, the infrastructure has fully redundant switching fabric
that provides fault-tolerance, and the equipment is usually
located in facilities such as data centers to provide reliability,
sufficient power and physical security.
⩥ IXP.
Answer: Physical infrastructures that provide the means for
ASes to interconnect and directly exchange traffic with one
another.
The ASes that interconnect at an ____ are called participant
ASes.
The physical infrastructure of an ____ is usually a network of
switches that are located either in the same physical location, or
they can be distributed over a region or even at a global scale.
⩥ Four reasons for IXPs increased popularity.
,Answer: 1. IXPs are large interconnection hubs handling large
traffic volumes. Some large IXPs handle as much traffic as Tier
1 ISPs
2. They play an important role in mitigating DDoS attacks
3. The "real world" infrastructures provide an excellent research
playground for multiple applications
4. IXPs are active marketplaces and technology innovation hubs.
They are providing new services beyond interconnection like
DDoS mitigation or SDN-based services
⩥ IXP Services.
Answer: 1. Public Peering
2. Private Peering
3. Route Servers and Service Level Agreements (SLAs)
4. Remote peering through resellers
, 5. Mobile Peering
6. DDoS Blackholing
7. Free value-add services: Extra things for the "good of the
internet" like Consumer broadband tests, DNS root name servers
and distribution of local time through NTP
⩥ Route Server.
Answer: ● Collects and shares routing information from its
peers or participants that connects with (i.e. IXP members that
connect to the RS).
● Executes its own BGP decision process and also re-advertise
the resulting information (I.e. best route selection) to all RS's
peer routers.
● Also known as Multi-lateral BGP peer sessions.
⩥ Router basic components.
Answer: - Input Ports
