cs6250 - exam 1 2025-2026 Most Recent Version
Comprehensive 150 Questions and Verified
Answers Accurate Solutions Already Graded A+
Get it 100% Correct
_____ filters are applied to ensure that each member AS only advertises routes that it
should advertise - CORRECT ANSWER: import
a multi-bit trie is _____ than a uni-bit trie representing same prefix database and
requires _____ memory accesses to perform a lookup - CORRECT ANSWER: shorter,
fewer
a packet is _____ when it is moved from a router's input link to the appropriate link -
CORRECT ANSWER: forwarded
According to the end-to-end principle, where should most of the Internet's
functionality/intelligence be implemented? - CORRECT ANSWER: At the edges of the
network
assume AS_X learns of a route to the same destination DEST_A via AS_Y and AS_Z; if
AS_X prefers to route its traffic through AS_Z due to peering or business, it can assign
a _____ LocalPref value to routes it learns from AS_Z, and thus using LocalPref, AS_X
can control where traffic exits the AS - CORRECT ANSWER: higher
assume that AS_X prefers routes advertised to AS_Y to go through R1 instead of R2;
for AS_Y to be influenced to choose R1 to forward traffic to AS_X, R1 must have a
_____ MED value, assuming that all other attributes are equal - CORRECT ANSWER:
lower
by 'stride', we refer to the number of bits that we check at every step when traversing a
trie - CORRECT ANSWER: true
,classify as operation of data plane or control plane: computing an IP header checksum -
CORRECT ANSWER: data plane
classify as operation of data plane or control plane: computing paths based on a
protocol - CORRECT ANSWER: control plane
classify as operation of data plane or control plane: decrementing time to live (TTL) -
CORRECT ANSWER: data plane
classify as operation of data plane or control plane: forwarding packets according to
installed rules in a middle box device - CORRECT ANSWER: data plane
classify as operation of data plane or control plane: forwarding packets at Layer 3 -
CORRECT ANSWER: data plane
classify as operation of data plane or control plane: running a protocol/logic to configure
a middle box device for load balancing - CORRECT ANSWER: control plane
classify as operation of data plane or control plane: running protocols to build a routing
table - CORRECT ANSWER: control plane
classify as operation of data plane or control plane: running the spanning tree protocol -
CORRECT ANSWER: control plane
classify as operation of data plane or control plane: switching packets at Layer 2 -
CORRECT ANSWER: data plane
consider the distance vector routing algorithm; which is used by each node to update
the node's distance vector - CORRECT ANSWER: bellman ford equation
, determine the mask for the address: 192.168.0.1/24 - CORRECT ANSWER:
255.255.255.0
Dijkstra's algorithm is a _____ algorithm, also referred to as a _____ algorithm -
CORRECT ANSWER: global, link-state
explain how in TCP cubic the congestion window growth becomes independent of RTTs
- CORRECT ANSWER: in cubic, the window growth only depends on the time between
two consecutive congestion events; one congestion event is the time when TCP
undergoes fast recovery, allowing cubic flows competing in the same bottleneck to have
approx. same size window independent of RTTs, achieving good RTT fairness
(based on time since last loss event, not RTTs or acks)
hot potato routing - CORRECT ANSWER: technique/practice of choosing a path within
the network by choosing the closest egress point based on intra-domain path cost (IGP
cost)
How did Licklider and his team in the early 1960s experiment with a precursor to the
internet? - CORRECT ANSWER: Connecting two computers over a dial-up telephone
line
in traditional routers, traffic forwarding is performed based on _____ - CORRECT
ANSWER: destination ip address only
one of the services offered by IXPs is protection against _____ attacks - CORRECT
ANSWER: DDoS
select the terms describing the distance vector algorithm:
- distributed
- centralized
Comprehensive 150 Questions and Verified
Answers Accurate Solutions Already Graded A+
Get it 100% Correct
_____ filters are applied to ensure that each member AS only advertises routes that it
should advertise - CORRECT ANSWER: import
a multi-bit trie is _____ than a uni-bit trie representing same prefix database and
requires _____ memory accesses to perform a lookup - CORRECT ANSWER: shorter,
fewer
a packet is _____ when it is moved from a router's input link to the appropriate link -
CORRECT ANSWER: forwarded
According to the end-to-end principle, where should most of the Internet's
functionality/intelligence be implemented? - CORRECT ANSWER: At the edges of the
network
assume AS_X learns of a route to the same destination DEST_A via AS_Y and AS_Z; if
AS_X prefers to route its traffic through AS_Z due to peering or business, it can assign
a _____ LocalPref value to routes it learns from AS_Z, and thus using LocalPref, AS_X
can control where traffic exits the AS - CORRECT ANSWER: higher
assume that AS_X prefers routes advertised to AS_Y to go through R1 instead of R2;
for AS_Y to be influenced to choose R1 to forward traffic to AS_X, R1 must have a
_____ MED value, assuming that all other attributes are equal - CORRECT ANSWER:
lower
by 'stride', we refer to the number of bits that we check at every step when traversing a
trie - CORRECT ANSWER: true
,classify as operation of data plane or control plane: computing an IP header checksum -
CORRECT ANSWER: data plane
classify as operation of data plane or control plane: computing paths based on a
protocol - CORRECT ANSWER: control plane
classify as operation of data plane or control plane: decrementing time to live (TTL) -
CORRECT ANSWER: data plane
classify as operation of data plane or control plane: forwarding packets according to
installed rules in a middle box device - CORRECT ANSWER: data plane
classify as operation of data plane or control plane: forwarding packets at Layer 3 -
CORRECT ANSWER: data plane
classify as operation of data plane or control plane: running a protocol/logic to configure
a middle box device for load balancing - CORRECT ANSWER: control plane
classify as operation of data plane or control plane: running protocols to build a routing
table - CORRECT ANSWER: control plane
classify as operation of data plane or control plane: running the spanning tree protocol -
CORRECT ANSWER: control plane
classify as operation of data plane or control plane: switching packets at Layer 2 -
CORRECT ANSWER: data plane
consider the distance vector routing algorithm; which is used by each node to update
the node's distance vector - CORRECT ANSWER: bellman ford equation
, determine the mask for the address: 192.168.0.1/24 - CORRECT ANSWER:
255.255.255.0
Dijkstra's algorithm is a _____ algorithm, also referred to as a _____ algorithm -
CORRECT ANSWER: global, link-state
explain how in TCP cubic the congestion window growth becomes independent of RTTs
- CORRECT ANSWER: in cubic, the window growth only depends on the time between
two consecutive congestion events; one congestion event is the time when TCP
undergoes fast recovery, allowing cubic flows competing in the same bottleneck to have
approx. same size window independent of RTTs, achieving good RTT fairness
(based on time since last loss event, not RTTs or acks)
hot potato routing - CORRECT ANSWER: technique/practice of choosing a path within
the network by choosing the closest egress point based on intra-domain path cost (IGP
cost)
How did Licklider and his team in the early 1960s experiment with a precursor to the
internet? - CORRECT ANSWER: Connecting two computers over a dial-up telephone
line
in traditional routers, traffic forwarding is performed based on _____ - CORRECT
ANSWER: destination ip address only
one of the services offered by IXPs is protection against _____ attacks - CORRECT
ANSWER: DDoS
select the terms describing the distance vector algorithm:
- distributed
- centralized
