Toughies

Question 1

What is the type of problem that is occurring when the counter value(s) say many input errors, few collisions?

Answer 1

Excessive noise caused by wrong cable category or EMI

Question 2

What is the type of problem that is occurring when the counter value(s) that have increasing late collisions?

Answer 2

Caused by collision domain, duplex mismatch or single cable too long

Question 3

What is the type of problem and root cause that is occurring when the counter value(s) say more than roughly 0.1% of all frames are collisions?

Answer 3

Collisions caused by duplex mismatch or DOS attack

Question 4

This Transport layer function enables receiving hosts to choose the correct application for which the data is destined, based on the destination port number

Answer 4

Multiplexing using ports

Question 5

This Transport layer function has the process of numbering and acknowledging data with Sequence and Acknowledgement header fields

Answer 5

Error Recovery (Reliability)

Question 6

This Transport layer function has a process that involve a sliding size that the two end devices dynamically agree upon at various points during the virtual connection

Answer 6

Flow control using Windowing

Question 7

This Transport layer function has a process that is used to initialize port numbers and Sequence and Acknowledgment fields

Answer 7

Connection establishment and termination

Question 8

This Transport layer function has a continuous stream of bytes from an upper-layer process that is ‘segmented’ for transmission and delivered to upper-layer processes at the receiving device, with the bytes in the same order

Answer 8

Ordered data transfer and data segmentation

Question 9

Access layer switches provide what types of features?

Answer 9

Port Security
VLANs
FastEthernet/GigabitEthernet
PoE
Link Aggregation
QoS

Question 10

Distribution layer switches provide what types of features?

Answer 10

Layer 3 support
High forwarding rate
Gig Ethernet / 10 Gig Ethernet
Redundant Components
Security policies / ACLs
Link Aggregation
QoS

Question 11

Core layer switches provide what types of features?

Answer 11

Layer 3 support
Very high forwarding rate
Gigabit Ethernet / 10 Gigabit Ethernet
Redundant components
Link Aggregation
QoS

Question 12

What does an OSPF Packet look like?

Answer 12

Version of OSPF
Packet Type
Packet Length
Router ID
Area ID
Checksum
Auth Type
Authentication
Data

Question 13

Each OSPF router maintains a link-state database containing the what received from all other routers

Answer 13

LSAs (Link-state advertisements)

Question 14

What are the general steps for Neighbor State Summary?

Answer 14

Down - No active neighbor detected
Initilialization - Hello packets sent and received by neighbors
2 WAY - Bi-Directional communication. Can see it’s own router ID received in Hello packets
Exstart - Primary and secondary roles determined
Exchange - DBD packets sent
Loading - Exchange of LSRs and LSU (With LSAs within the LSU)
Full - Neighbors full adjacent

Question 15

What settings must be matched for a pair of OSPF routers to form an adjacency?

Answer 15

They must be in each other’s neighbor list
Hello & Dead Intervals
Area ID
IP Subnet
Authentication Flag
Stub Area Flag
MTU and MTU IP Size

Question 16

Routers which have all of their OSPF interfaces in an area and are not in a backbone are considered what?

Answer 16

Normal Area Routers

Question 17

How do Normal Area Routers learn their routes

Answer 17

From the ABRs

Question 18

What are the destination multicast addresses for OSPF?

Answer 18

224.0.0.5
224.0.0.6

Question 19

This type of router redistributes routes from different routing protocols into OSPF Normal Area Routers

Answer 19

Autonomous System Boundary Router (ASBR)

Question 20

What are the 6 Steps / Characteristics of OSPF?

Answer 20

Discover Neighbors
Form Adjacencies
Flood the Link State Database
Compute the Shortest Path
Install the Best Routes Into The Routing Table
Respond to Network Changes

Question 21

What is the FF02::5 OSPFv3 multicast address used for?

Answer 21

All routers multicast

Question 22

What is the FF02::6 OSPFv3 multicast address used for?

Answer 22

DR/BDR multicast updates

Question 23

Full adjacency occurs when two routers have exchanged any necessary __________ and have identical __________ __________?

Answer 23

LSUs
Link-state databases

Question 24

OPSF uses Dijkstra’s algorithm to create a what?

Answer 24

SPF Tree

Question 25

What is the chief characteristic of an ABR?

Answer 25

It separates the LSA Flooding Zones

Question 26

How does a DR get elected?

Answer 26

It has the highest priority. In which case either the Router ID is the highest or it’s been manually to set to have a higher OSPF priority on the interface.

Manual priority check first
Highest configured router id
highest loopback address
highest IP address

Question 27

This command configures the HTTP server for authentication using the enable password, which is the default method of HTTP server user authentication

Answer 27

ip http authentication enable

Question 28

This command enables the HTTP server

Answer 28

ip http server

Question 29

Manually setting the duplex mode and speed of switch ports can cause issues if one end is __________ or set to __________

Answer 29

Mismatched
Autonegotiation

Question 30

What is the type of problem that is occurring when the counter value(s) say many input errors, few collisions?

Answer 30

Excessive noise caused by wrong cable category or EMI

Question 31

What is the type of problem and root cause that is occurring when the counter value(s) say more than roughly 0.1% of all frames are collisions?

Answer 31

Collisions caused by duplex mismatch or DOS attack

Question 32

What is the type of problem that is occurring when the counter value(s) have increasing late collisions?

Answer 32

Caused by collision domain, duplex mismatch or single cable too long