Chapter 4
TCP (Transmission Control Protocol) operates in which layer of the OSI model?
Transport
ARP relies on _____, which transmits simultaneously to all nodes on a particular network segment.
broadcasting
Switches that operate anywhere between Layer 4 and Layer 7 are also known as ____or application switches.
content switches
List three IGPs (interior gateway protocols).
(Any three) RIP, RIPv2, OSPF, IS-IS, EIGRP
What is the Internet standard MTU?
1,500 bytes.
A routing protocol's reliability and priority are rated by what measurement?
AD (administrative distance)
What is the difference between dynamic ARP table entries and static ARP table entries?
Dynamic- created when a client makes an ARP request for information that could not be satisfied by data already on the ARP table Static - entries that someone has entered manually using the ARP utility
Give three examples of routing metrics used by routers to determine the best of various available routing paths.
Hop count, Latency, MTU
At which layer of the OSI model is a packet encapsulated with its own header and trailer to create a frame?
Layer 2
Which protocol is supported by ICMPv6 to facilitate neighbor discovery on an IPv6 network?
NDP (Neighbor Discovery Protocol)
Which of the following devices joins two or more networks and passes packets from one network to another? A. Repeater B. Web server C. Router D. Hub
C. Router
What field in a TCP segment is used to determine if an arriving data unit exactly matches the data unit sent by the source?
Checksum
When a router can't determine a path to a message's destination, where does it send the message?
gateway of last resort
Which two fields in an Ethernet frame help synchronize device communications but are not counted toward the frame's size?
preamble and SFD fields
Which Linux utility provides output similar to Wireshark's?
tcpdump
Which OSI layer is responsible for directing data from one LAN to another?
Network
At which OSI layer does IP operate?
Network Layer
What four functions do all routers perform?
1. Connecting Dissimilar networks (ex. lan and wan) 2. Interpreting layer 3 and often layer 4 addressing 3. Determining the best path for data to follow from point A to point B 4. Rerouting the traffic if the first choice path is down but another is available.
What three characteristics about TCP distinguish it from UDP?
1. Connection-oriented 2. Sequencing and checksum 3. Flow control
What process is used to establish a TCP connection?
3 way handshake
Which of the following routing protocols are used by border routers and exterior routers to distribute data outside of an autonomous system? A. BGP B. RIP C. OSPF D. IS-IS
A. BGP
Which of the following routing metrics is a measure of the number of network segments crossed? A. hop count B. latency C. MTU D. Cost
A. hop count
Which routing protocol does an exterior router use to collect data to build its routing tables?
BGP (Border Gateway Protocol)
True or False: UDP provides error checking and sequencing.
False
Which Network layer protocol reports on the success or failure of data delivery?
ICMP
Which two protocols manage neighbor discover processes on IPv4 networks?
ICMP and ARP
What database does a router consult before determining the most efficient path for delivering a message?
Routing table
What kind of route is created when a network administrator configures a router to use a specific path between nodes?
Static route
Which protocol's header would a Layer 4 device read and process?
TCP