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Ethernet Technologies

Subject : it-skills

Instructions:

Answer 50 questions in 15 minutes.
If you are not ready to take this test, you can study here.
Match each statement with the correct term.
Don't refresh. All questions and answers are randomly picked and ordered every time you load a test.

This is a study tool. The 3 wrong answers for each question are randomly chosen from answers to other questions. So, you might find at times the answers obvious, but you will see it re-enforces your understanding as you take the test each time.

1. What information is stored in TCAM?
ARP requests and replies; IP packets requiring an ICMP response; IP broadcasts to be relayed; Routing protocol updates; CDP packets; Packets needing encryption; Packets triggering NAT; Other non-IP packets
Security and QoS ACLs
Switch(config)#errdisable recovery cause {all | {cause-name}}
66-300 metres for 50 micron MMF; 33 metres for 62.5 micron MMF

2. What happens when autonegotiating of link duplex mode fails on a Fast Ethernet link?
By electrical signalling so that either end of a link can determine what speed the other end is trying to use
The switch port falls back to default setting of half duplex
FIB with adjacency table
Gigabit Ethernet over 4 pairs EIA/TIA Category 5 UTP

3. What is the name of the CEF engine that forwards packets in hardware?
Enable error-disable for all possible causes
Trunk
The Layer 3 forwarding engine
100 metres

4. What is the operational mode of a switch port that is a member of one VLAN?
Switch(config-if)#no ip route-cache cef
SC or MT-RJ
Static access
Switch#show interfaces {interface}

5. Configures a switch port with a static access VLAN assignment
With a mask value in addition to binary values to decide which keys in a table are relevant
10 Gigabit Ethernet over 9 micron SMF (1310 nm serial laser)
Switch#show cef not-cef-switched
Switch(config-if)#switchport access vlan {vlan}

6. What is MLS?
Switch(config)#define interface-range {macro-name} {type} {module}/{number} [- {number}] [ - {type} {module}/{number} ...]
Multilayer Switching
A name assigned to a ranges of interfaces
Switch(config)#default interface {interface}

7. Disables CEF operation on an interface
Switch(config-if)#no ip route-cache cef
Dynamic
66-300 metres for 50 micron MMF; 33 metres for 62.5 micron MMF
10GBASE-SR/SW - 10GBASE-LR/LW - 10GBASE-ER/EW - 10GBASE-LX4/LW4 - 10GBASE-CX4

8. What is the name of a Layer 3 physical interface on a switch?
A station must wait its turn to transmit; it can't transmit and receive at the same time
Native routed interface
The Punt adjacency
SVI or native routed interface

9. Where is source and destination addresses and other relevant protocol information for access lists stored in the TCAM table?
Source IPX network (/32); Destination IPX network (/32); Destination node (/48); IPX packet type (/16)
Switch#show errdisable detect
In TCAM Value entries
SVI

10. Resets the configuration of a switch port to its default values
Switch(config)#default interface {interface}
15 metres
Switch(config)#errdisable detect cause link-flap
Switch(config-if)#speed {10 | 100 | 1000 | auto}

11. What is 100BASE-TX?
Switch(config)#mac address-table aging-time {seconds}
Fast Ethernet over 2 pairs EIA/TIA Category 5 UTP
Tunnel
70 km for 9 micron SMF; 100 km for 8 micron SMF

12. What is 1000BASE-CX?
Switched virtual interface (SVI)
Compiling Access Control Entries (ACE) into the TCAM table
CEF glean
Gigabit Ethernet over 1 pair Shielded Twisted Pair (STP) cabling

13. What tables are maintained by the CEF Layer 3 forwarding engine?
Interconnecting switches in a campus network
Switch(config)#errdisable detect cause channel-misconfig
10 Gigabit Ethernet over 9 micron SMF (1550 nm serial laser)
FIB with adjacency table

14. What is 1000BASE-ZX?
Half duplex
On
Off
Gigabit Ethernet over 1 pair 8 or 9 micron SMF (1550 nm laser)

15. What are the names of the two basic generations of MLS?
Flooding a frame with unknown destination MAC address out all ports assigned to the source port VLAN except the source port itself
Switch(config)#errdisable detect cause rootguard
Switch#show running-config interface {interface}
Route caching and topology based

16. What CEF optimisation technique cache FIB entries in switch line cards?
550 metres for 50 or 62.5 micron MMF; 10 km for 9 micron SMF
Accelerated CEF (aCEF)
1000BASE-T full duplex followed by 1000BASE-T half duplex
Full duplex

17. Disables CEF operation globally
7 100BASE-T2 full duplex; 6 100BASE-TX full duplex; 5 100BASE-T2 half duplex; 4 100BASE-T4; 3 100BASE-TX; 2 10BASE-T full duplex; 1 10BASE-T
Manually by administratively disabling and re-enabling the port
Switch(config)#no ip cef
Security and QoS ACLs

18. What is TCAM overflow?
CEF glean
10 Gigabit Ethernet over copper CX4 with Infiniband connectors
When there are more access list entries and Layer 4 operations than available Mask/Value and LOU entries
10 Gigabit Ethernet over 9 micron SMF (1550 nm serial laser)

19. What is IEEE?
Listen to the first packet and put its resulting destination in the MLS cache; Route subsequent packets in the same flow based on the MLS cache
Gigabit Ethernet over 1 pair 8 or 9 micron SMF (1550 nm laser)
Institute of Electrical and Electronics Engineers
100 metres

20. What is the content of TCAM Mask entries?

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21. What is LAN PHY used for?
Carrier Sense Multiple Access Collision Detection
Interconnecting switches in a campus network
Down - static access - trunk or tunnel
Logical Operation Unit

22. Displays administrative and operational status for a specified interface
Switch#show interfaces {interface}
They are dropped (ARP throttling)
Source MAC (/48); Destination MAC (/48); Ethertype (/16)
Through exchange of information - which means that for one end to successfully negotiate duplex mode the other end must also be set to autonegotiate

23. What are the reasons for packets being dropped by CEF?
SVI
7 100BASE-T2 full duplex; 6 100BASE-TX full duplex; 5 100BASE-T2 half duplex; 4 100BASE-T4; 3 100BASE-TX; 2 10BASE-T full duplex; 1 10BASE-T
Compiling Access Control Entries (ACE) into the TCAM table
Encapsulation failure; Unresolved address; Unsupported protocol; No valid route; No valid adjacency; Checksum error

24. Selects a switch port interface and enters interface configuration mode
The Layer 3 engine
Listen to the first packet and put its resulting destination in the MLS cache; Route subsequent packets in the same flow based on the MLS cache
Switch(config)#interface {type}{module}/{number}
SVI

25. Enables error-disable when the Port Aggregation Protocol (PAgP) is flapping
Switch(config)#errdisable detect cause pagp-flap
Configure the appropriate values manually on both ends of the link
Routing table and ARP table
SVI

26. What are the symptoms of a duplex setting mismatch between two ends of a link?
Electromagnetic Interference
Slow response times - low throughput - runts and other input errors on the switch ports
Accelerated CEF (aCEF)
15 metres

27. What is the DTP negotiation mode of a switch port configured as dynamic?
Layer 2 source and destination MAC addresses; Layer 3 Time-To-Live (TTL) value and header checksum
With a mask value in addition to binary values to decide which keys in a table are relevant
On
A switch port that has been shut down automatically due to a serious error condition

28. What information is stored in CAM?
Interconnecting switches in a campus network
The table of learned MAC addresses - ports - and VLAN information
Wide-Wavelength Division Multiplexing
Cabling specification for 10 Mbps Ethernet over Unshielded Twisted Pair (UTP) cabling

29. Displays a list of all interfaces in an error-disabled state
Switch(config-if)#switchport access vlan {vlan}
Manually by administratively disabling and re-enabling the port
Switch#show interfaces status err-disabled
Switch#show running-config interface {interface}

30. What CEF adjacency is used to switch packets destined for the null interface?
The Null adjacency
Switch(config-if)#shutdown
550 metres for 50 or 62.5 micron MMF; 10 km for 9 micron SMF
Collision domain

31. Enables automatic re-enabling of error-disabled ports
Through exchange of information - which means that for one end to successfully negotiate duplex mode the other end must also be set to autonegotiate
Switch(config)#errdisable recovery cause {all | {cause-name}}
Source IP (/32); Destination IP (/32); Protocol (/16); IP ToS (/8); IGMP message type (/8)
400 metres half duplex and 2000 metres full duplex

32. What is the DTP negotiation mode of a switch port configured as static access?
Layer 3 routing information builds and pre-populates a single database of the entire network topology; All table lookups are performed in hardware with the longest matching destination used in forwarding
A name assigned to a ranges of interfaces
SVI
Off

33. Displays entries in the Forwarding Information Base (FIB) for a specific subnet
Switch(config)#errdisable detect cause dhcp-rate-limit
Process the first packet in a traffic flow to determine the destination
S = Short; L = Long; E = Extra-long
Switch#show ip cef {network} [{mask}] [longer-prefixes] [detail]

34. How is the TCAM organised?
The CEF entry version number
Security and QoS ACLs
By Mask/Value - where each unique mask has eight value patterns associated with it
The switch port falls back to default setting of half duplex

35. What is 10GBASE-SR/SW?
Gigabit Ethernet over 1 pair 8 or 9 micron SMF (1550 nm laser)
Switch#show ip cef {network} [{mask}] [longer-prefixes] [detail]
10 Gigabit Ethernet over 50 or 62.5 micron MMF (850 nm serial laser)
66-300 metres for 50 micron MMF; 33 metres for 62.5 micron MMF

36. Displays error-disabled recovery timer information
1000BASE-CX - 1000BASE-T - 1000-BASE-SX - 1000-BASE-LX/LH and 1000-BASE-ZX
When the Spanning Tree Protocol (STP) has put the switch port in learning or forwarding state
70 km for 9 micron SMF; 100 km for 8 micron SMF
Switch#show errdisable recovery

37. What CEF optimisation replicates the entire FIB table among switch line cards?
The Punt adjacency
15 metres
Distributed CEF (dCEF)
Static access

38. What are the Fast Ethernet autonegotiation selection priorities?
Security and QoS ACLs
7 100BASE-T2 full duplex; 6 100BASE-TX full duplex; 5 100BASE-T2 half duplex; 4 100BASE-T4; 3 100BASE-TX; 2 10BASE-T full duplex; 1 10BASE-T
Content-Addressable Memory
CEF punt

39. Displays switch port information for a specified interface
1000BASE-CX - 1000BASE-T - 1000-BASE-SX - 1000-BASE-LX/LH and 1000-BASE-ZX
Switch#show interfaces {interface} switchport
By electrical signalling so that either end of a link can determine what speed the other end is trying to use
400 metres half duplex and 2000 metres full duplex

40. What is 10GBASE-LR/LW?
10 Gigabit Ethernet over 9 micron SMF (1310 nm serial laser)
A proprietary connector with a high-data-rate copper cable with enhanced signal integrity and EMI performance
Switch#show ip cef {interface} [detail]
Switch#show errdisable recovery

41. What are the letters used with 10GBASE-X two-letter suffixes to specify the transceiver wavelengths?
IEEE 802.3
Switch#show errdisable recovery
S = Short; L = Long; E = Extra-long
Value - Mask - and Result (VMR)

42. What is the maximum cabling distance for Fast Ethernet over 62.5/125 micron multimode fibre?
400 metres half duplex and 2000 metres full duplex
Creating the VLAN
Wide-Wavelength Division Multiplexing
7 100BASE-T2 full duplex; 6 100BASE-TX full duplex; 5 100BASE-T2 half duplex; 4 100BASE-T4; 3 100BASE-TX; 2 10BASE-T full duplex; 1 10BASE-T

43. What is the timer range for automatic re-enabling of error-disabled ports?
Switch#show ip cef
Switch(config)#errdisable detect cause rootguard
Off
From 30 seconds to 86 -400 seconds (24 hours)

44. What is 1000BASE-SX?
Gigabit Ethernet over 4 pairs EIA/TIA Category 5 UTP
Gigabit Ethernet over 1 pair 50 or 62.5 micron MMF (850 nm laser)
Switch(config)#errdisable detect cause psecure-violation
Process the first packet in a traffic flow to determine the destination

45. Displays CEF Drop statistics with number of packets and reason for each line card
275 metres for 62.5 micron MMF; 550 metres for 50 micron MMF
Switch(config)#define interface-range {macro-name} {type} {module}/{number} [- {number}] [ - {type} {module}/{number} ...]
Switch#show cef drop
GBIC-to-GBIC connection between stacking Catalyst switches or between any two Gigabit switch ports over a short distance

46. Creates an interface-range macro
Layer 3 routing information builds and pre-populates a single database of the entire network topology; All table lookups are performed in hardware with the longest matching destination used in forwarding
Switch#show mac address-table dynamic [address {mac-address}] [interface {interface}] [vlan {vlan}]
Switch(config)#define interface-range {macro-name} {type} {module}/{number} [- {number}] [ - {type} {module}/{number} ...]
275 metres for 62.5 micron MMF; 550 metres for 50 micron MMF

47. What is 100BASE-FX?
Fast Ethernet over 62.5/125 micron multimode fibre (MMF) or 9 micron singlemode fibre (SMF)
Distributed CEF (dCEF)
In parallel revealing the best (longest) match in a single table lookup
Process the first packet in a traffic flow to determine the destination

48. Changes an interface to a layer 3 interface and erases all layer 2 interface configurations
Switch#show mac address-table count [address {mac-address}] [interface {interface}] [vlan {vlan}]
SVI or native routed interface
Switch(config-if)#no switchport
Source MAC address; Port of arrival; VLAN; Time stamp

49. What packets are immediately sent to the CEF Layer 3 engine for further processing?

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50. When do collisions occur?
When one station transmits at the same time as another on a shared medium
Static access
S = Short; L = Long; E = Extra-long
Switch(config)#errdisable detect cause l2ptguard