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Computer Networks → Introduction to Computer Networks 30

PIM-DM uses
Flood and prune model
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SSM (Source Specific Multicast) requires
Receiver to specify both group and source
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MSDP is used for
Interconnecting multicast domains across AS boundaries
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Anycast RP provides
RP redundancy and load sharing
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IGMP snooping prevents
Multicast flooding to all ports on switch
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HTTP/2 server push is used to
Proactively send resources before client requests
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HTTP/2 stream priority is
Weight-based hint for client (deprecated in HTTP/3)
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CT log is
Public transparency log of all issued TLS certificates
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OCSP stapling reduces
OCSP lookup latency for clients
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CAA DNS record specifies
Which CAs are allowed to issue certs for domain
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DNSSEC chain of trust starts from
ICANN root zone
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Network access layer PDU is
Frame
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Internet layer PDU is
Packet
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Process to process communication uses
Port numbers
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Host to host communication uses
IP addresses
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Node to node communication uses
MAC addresses
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Bit to physical signal conversion is
Physical layer
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Frame to bit stream is
Data Link layer
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End-to-end delivery with reliability is
Transport layer
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ARP is which layer protocol
Layer 2.5 (between 2 and 3)
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DNS is which layer
Layer 7 (Application)
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MPLS is sometimes called
Layer 2.5
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IP operates at which layer
Layer 3
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802.1Q operates at which layer
Layer 2
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STP operates at which layer
Layer 2
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Computer network primary purpose is
Resource sharing communication and distributed processing
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Protocol is
Set of rules governing data communication
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Network architecture defines
Structure of hardware software and protocols in a network
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Latency components include
Propagation transmission processing and queuing delay
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Throughput vs bandwidth difference is
Bandwidth is max capacity throughput is actual delivered rate
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Computer Networks → HTTP and HTTPS 2

HTTPS certificate validation includes
Chain trust expiry domain name
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HTTPS HPKP is
HTTP Public Key Pinning (deprecated due to risk)
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Computer Networks → Presentation Layer 3

TLS session resumption uses
Session ticket or session ID to reduce handshake
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TLS 1.3 handshake completes in
1 RTT (or 0-RTT for resumption)
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SSL/TLS is best described as
Layer between 4 and 7
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Computer Networks → Transport Layer 1

Transport layer PDU is
Segment
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Computer Networks → Application Layer 2

Application layer PDU is
Data/Message
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DHCP is which layer
Layer 7 (Application uses UDP)
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Computer Networks → Network Layer 1

ICMP is which layer protocol
Layer 3 (uses IP but is Network layer)
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Computer Networks → Data Link Layer 1

Ethernet operates at which layers
1 and 2
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