N+ Chap 3 RQs

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Which protocol’s header would a Layer 4 device read and process?

Port Number

What number does a host use to identify the application involved in a transmission?


What field in a TCP segment is used to determine if an arriving data unit exactly matches the data unit sent by the source?

Network Layer (Layer 3)

At which layer does IP operate?

Network Layer (Layer 3)

Which OSI layer is responsible for directing data from one LAN to another?

Static Route

What kind of route is created when a Net Admin configs a router to use a specific path between nodes?

Gateway of Last Resort

When a router can’t determine a path to a message’s destination, where does it send the message?

AD (Administrative Distance)

A routing protocol’s reliability and priority are rated by what measurement?

BGP (Border Gateway Protocol)

Which routing protocol does an exterior router use to collect data to build its routing table?


When messages to a remote web server are being lost for no reason and you suspect the problem might be a pth MTU black hole, which TCP/IP utility can you use to diagnose the problem?

TCP is connection-based, Sequencing and Checksums, and Flow Control

What three characteristics distinguish TCP from UDP?

TCP uses a process called the Three-Step Handshake

What process is used to establish a TCP connection?

IGMP ( Internet Group Management Protocol ) and ARP (Address Resolution Protocol)

Which two protocols are essential to IPv4 networks, but whose functions are performed by ICMPv6 on IPv4 networks?

Statics ARP tables are those that someone has entered manually using the ARP utility via arp command. Dynamic ARP tables are created when a client makes an arp request that could not be satisfied by data already in the arp table.

What is the difference between dynamic ARP table entries and static ARP table entries?

Connect dissimilar networks. Interpret L3 and L4 addressing, determine best path for data to flow, and reroute traffic if primary path is down

What four functions do all router perform?

Routing Table

What database does a router consult before determining the most efficient path for delivering a message?

Routing loop

Manually modifying a routing table can cause messages to get stuck hopping between a limited number of routers. What is this problem called?

Hop Count, Routing Cost, and latency.

Give three examples of routing metrics used by routers to determine the best of various available routing paths.

A looking glass site

What kind of web site allows you to remotely collect network routing information back to your actual location?

RIP (Routing Information Protocol), RIPv2 (Routing Information Protocol Version 2), and OSPF (Open Shortest Path First)

List three interior gateway protocols (IGPs)

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