STIG Packet Switching Detail - Asher Levin | Biblioteka

1

When your home router receives your packet for YouTube, what is its primary action?

Stores the video locally for faster playback next time

Checks the destination and forwards the packet toward the best next hop

Converts the request into a different video format

Downloads the entire video before forwarding anything

1

From the Cayman ISP, several paths exist (Jamaica, Florida, Mexico). Which rationale best explains choosing Florida in the demo?

It has the fewest countries on the path

It offers the best mix of cost and less lag according to the routing table

It is the only path with enough storage

It is the only path routers can understand

1

In the simplified packet shown, which field lets intermediate routers decide where to send the packet next?

Data

Source IP

Destination IP

Browser rendering hints

1

Why does your browser check its local DNS cache before asking the DNS server?

The cache always has the newest IP address

A local cache lookup is faster than a network DNS request

DNS servers cannot answer video-related domains

Caches are legally required for all lookups

1

If the cache does not contain YouTube’s IP, what happens next in the sequence shown?

The router invents an IP and forwards

The browser asks the YouTube server for its own address

The browser queries the local DNS server for the IP

The ISP automatically streams the video without an IP

1

When the Cayman ISP has multiple potential next hops, which combination of factors drives the decision in the lesson?

Cost (hops), latency (lag), bandwidth, and reliability

Number of borders crossed and cable age

Popularity of the site and time of day

CPU temperature of each router and rack position

1

When wanting a video or a website, what order is correct from below?

Browser rendering → DNS resolution → Packet creation → Local routing

Local routing → Packet creation → DNS resolution → Browser rendering

Cache check → DNS resolution → Packet creation → Routing through ISP and US → Content return → Browser rendering

Packet creation → Browser rendering → DNS resolution → Content return

1

When wanting a video or a website, what order is correct from below?

Browser rendering → DNS resolution → Packet creation → Local routing

Local routing → Packet creation → DNS resolution → Browser rendering

Cache check → DNS resolution → Packet creation → Routing through ISP and US → Content return → Browser rendering

Packet creation → Browser rendering → DNS resolution → Content return

1

What core reason explains why the packet visits several routers before reaching the YouTube server?

Each router adds video frames to the packet

Each router forwards closer to the destination based on its routing table

Routers decrypt and re-encode the entire page content

Routers convert HTML into CSS and JavaScript on the way