Chapter 4 Review (Data Communications)

At which OSI layer does IP operate? a. Transport layer b. Application layer c. Data Link layer d. Network layer

d. Network Layer

What kind of route is created when a network administrator configures a router to use a specific path between nodes? a. Best path b. Trace route c. Default route d. Static route

d. Static Route

Which two fields in an Ethernet frame help synchronize device communications but are not counted toward the frame's size?

Preamble and SFD

What process is used to establish a TCP connection?

Three-way process called handshake

Which OSI layer is responsible for directing data from one LAN to another? Physical layer Network layer Transport layer Data Link layer

Network Layer

What three characteristics distinguish tcp from udp?

TCP is connection oriented protocol and UDP is connectionless. TCP messages arrive in order while the order of messages from UDP is uncertain. TCP data is like a stream and data packets may arrive in multiple packets, UDP is sent individually and packets are guaranteed to arrive whole.

What is the Internet standard MTU? a. 65,535 bytes b. 1,522 bytes c. 1,500 bytes d. 9,198 bytes

c. 1,500 bytes

Which two protocols manage neighbor discovery processes on IPv4 networks? a. BGP and OSPF b. IPv4 and IPv6 c. ICMP and ARP d. TCP and UDP

c. ICMP and ARP

Which protocol's header would a Layer 4 device read and process? a. HTTP b. ARP c. TCP d. IP

c. TCP

Which routing protocol does an exterior router use to collect data to build its routing tables? a. OSPF b. IP c. RIPv2 d. BGP

d. BGP

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

(Any three) Hop count, theoretical bandwidth, actual throughput, path latency (or delay), path load, MTU, cost, reliability, network topology

What four functions do all routers perform?

1. Connect dissimilar networks. 2. Interpret Layers 3 and 4 addressing and other information. 3. Determine the best path for data to follow. 4. Reroute traffic if a primary path is down but another path is available.

List three IGPs (interior gateway protocols).

Any three) RIP, RIPv2, OSPF, IS-IS, EIGRP

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

Its routing table

Which protocol is supported by ICMPv6 to facilitate neighbor discovery on an IPv6 network?

NDP (Neighbor Discovery Protocol)

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

Static: Those that someone has entered manually using the arp utility via arp command, Dynamic: created when a client makes an arp request that could not be satisfied by data already in the arp table

A routing protocol's reliability and priority are rated by what measurement? a. AD b. Routing table c. MTU d. Latency

a. AD (Active Directory)

What field in a TCP segment is used to determine if an arriving data unit exactly matches the data unit sent by the source? a. Checksum b. DiffServ c. Acknowledgment number d. Source port

a. Chesksum

When a router can't determine a path to a message's destination, where does it send the message? a. Gateway of last resort b. Default gateway c. Administrative distance d. Routing table

a. Gateway of Last Resort