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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. Enables error-disable for the presence of invalid GBIC or SFP modules
Source IP (/32); Destination IP (/32); Protocol (/16); IP ToS (/8); IGMP message type (/8)
IEEE 802.3ab
Tunnel
Switch(config)#errdisable detect cause gbic-invalid

2. What is the content of TCAM Result entries?
Dynamic
Numeric values that represent what action to take after the TCAM lookup occurs
10 Gigabit Ethernet over copper CX4 with Infiniband connectors
Carrier Sense Multiple Access Collision Detection

3. What are the basic operations that a frame undergoes as it passes through a multilayer switch?
IEEE 802.3z
Switch(config)#errdisable detect cause gbic-invalid
Manually by administratively disabling and re-enabling the port
Ingress queueing; Destination MAC lookup (CAM); Destination IP lookup (FIB); Security ACL lookup (TCAM); QoS ACL lookup (TCAM); Layer 3 packet rewrite; Egress queueing

4. Displays a list with status of all interfaces
Switch#show interfaces status
Switch(config)#define interface-range {macro-name} {type} {module}/{number} [- {number}] [ - {type} {module}/{number} ...]
Switch(config)#errdisable detect cause udld
SVI

5. What tables are maintained by the CEF Layer 3 engine?
Switch(config)#errdisable recovery cause {all | {cause-name}}
Routing table and ARP table
FIB with adjacency table
A switch port that has been shut down automatically due to a serious error condition

6. How is link duplex mode determined on Fast Ethernet links configured to autonegotiate?
300 seconds
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 detect cause {all | {cause-name}}
Tunnel

7. What is the default duplex mode of a 10 Mbps Ethernet interface?
SVI or native routed interface
Accelerated CEF (aCEF)
Half duplex
Switch(config)#mac address-table aging-time {seconds}

8. What function is performed by the Feature Manager (FM)?
Partition and tune the TCAM on some Catalyst switches into areas for different functions
Compiling Access Control Entries (ACE) into the TCAM table
550 metres for 50 or 62.5 micron MMF; 10 km for 9 micron SMF
IEEE 802.3z

9. What is 10GBASE-LR/LW?
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
Bundling together two to eight full duplex Fast Ethernet links to act as a single physical link
10 Gigabit Ethernet over 9 micron SMF (1310 nm serial laser)

10. Enables error-disable when the Port Aggregation Protocol (PAgP) is flapping
With a mask value in addition to binary values to decide which keys in a table are relevant
SC or MT-RJ
Switch(config)#errdisable detect cause pagp-flap
Source IPX network (/32); Destination IPX network (/32); Destination node (/48); IPX packet type (/16)

11. What RJ-45 pins have been swapped in a Category 5 UTP crossover cable for Fast Ethernet?
SVI
Switch(config)#errdisable detect cause l2ptguard
1 -2 on one end with 3 -6 on the other end
Source IP (/32) - Destination IP (/32) - Protocol (/16) - IP ToS (/8) - Source port (/16) - Source operator (/4) - Destination port (/16) - Destination operator (/4)

12. What Ethernet ports allow for autonegotiation?
With a mask value in addition to binary values to decide which keys in a table are relevant
UTP Fast Ethernet and Gigabit Ethernet
Full duplex only
Ingress queueing; Destination MAC lookup (CAM); Destination IP lookup (FIB); Security ACL lookup (TCAM); QoS ACL lookup (TCAM); Layer 3 packet rewrite; Egress queueing

13. What is 100BASE-T4?
Slow response times - low throughput - runts and other input errors on the switch ports
Fast Ethernet over 4 pairs EIA/TIA Category 3 - 4 - 5 UTP
Switch(config)#errdisable detect cause security-violation
Configure the appropriate values manually on both ends of the link

14. What combinations are TCAM entries composed of?
Value - Mask - and Result (VMR)
FIB with adjacency table
Compiling Access Control Entries (ACE) into the TCAM table
Multilayer Switching

15. Disables CEF operation on an interface
Source MAC address; Port of arrival; VLAN; Time stamp
Security and QoS ACLs
Accelerated CEF (aCEF) and Distributed CEF (dCEF)
Switch(config-if)#no ip route-cache cef

16. What is the maximum cabling distance for 10GBASE-LX4/LW4?
Switch(config)#errdisable detect cause {all | {cause-name}}
Compiling Access Control Entries (ACE) into the TCAM table
300 metres for 50 or 62.5 micron MMF; 10 km for 9 micron SMF
IEEE 802.3z

17. Sets the administrative mode of a switch port to access
Switch(config-if)#switchport mode access
A three-fold combination of 0 - 1 and X (don't care)
Switch(config)#errdisable detect cause storm-control
Switch#show running-config interface {interface}

18. What is the maximum cabling distance for 1000BASE-CX?
SC fibre optic or RJ-45 UTP
550 metres for 50 or 62.5 micron MMF; 10 km for 9 micron SMF
10GbE operates only at full duplex
25 metres

19. Adds a static entry to the MAC address table
CEF glean
Switch(config)#mac address-table static {mac-address} vlan {vlan} interface {interface}
Partition and tune the TCAM on some Catalyst switches into areas for different functions
Switch(config)#errdisable detect cause security-violation

20. What RJ-45 pins must be swapped in a Category 5 UTP crossover cable for Gigabit Ethernet?
1 -2 on one end with 3 -6 on the other end - and 4 -5 on one end with 7 -8 on the other end
Gigabit Ethernet over 1 pair 8 or 9 micron SMF (1550 nm laser)
Switch#show mac address-table static [address {mac-address}] [interface {interface}] [vlan {vlan}]
The table of learned MAC addresses - ports - and VLAN information

21. Enables error-disable when a storm control threshold has been exceeded on a port
Switch(config)#interface {type}{module}/{number}
Fast Ethernet over 62.5/125 micron multimode fibre (MMF) or 9 micron singlemode fibre (SMF)
Switch(config)#errdisable detect cause storm-control
Source IP (/32); Destination IP (/32); Protocol (/16); IP ToS (/8); IGMP message type (/8)

22. What is 100BASE-FX?
Fast Ethernet over 62.5/125 micron multimode fibre (MMF) or 9 micron singlemode fibre (SMF)
Dynamic
A station must wait its turn to transmit; it can't transmit and receive at the same time
By electrical signalling so that either end of a link can determine what speed the other end is trying to use

23. What is CEF?
Switch#show ip cef
Switch(config)#errdisable detect cause psecure-violation
Cisco Express Forwarding
Switch(config-if)#speed {10 | 100 | 1000 | auto}

24. What is an interface-range macro?
SVI
Switch(config)#interface range {type}{module}/{number} [- {number}] [ - {type}{module}/{number} ...]
Switch#clear mac address-table [dynamic] [address {mac-address}] [interface {interface}] [vlan {vlan}]
A name assigned to a ranges of interfaces

25. What is a SVI?
Switch(config-if)#speed {10 | 100 | 1000 | auto}
The Null adjacency
Switched virtual interface (SVI)
Security and QoS ACLs

26. Configures a switch port with a static access VLAN assignment
Switch(config)#errdisable detect cause bpduguard
Switch(config-if)#switchport access vlan {vlan}
R = LAN PHY; W = WAN PHY
1000BASE-CX - 1000BASE-T - 1000-BASE-SX - 1000-BASE-LX/LH and 1000-BASE-ZX

27. Displays static CAM table entries
Feature Manager (FM) and Switching Database Manager (SDM)
Switch#show mac address-table static [address {mac-address}] [interface {interface}] [vlan {vlan}]
Source IP (/32); Destination IP (/32); Protocol (/16); IP ToS (/8); IGMP message type (/8)
The CEF entry version number

28. Adds a description to an interface configuration
Full duplex
On
Switch(config-if)#description {string}
GBIC-to-GBIC connection between stacking Catalyst switches or between any two Gigabit switch ports over a short distance

29. What denotes the number of times a CEF entry has been updated since the CEF table was created?
The Layer 3 engine
The CEF entry version number
Interconnecting with existing Synchronous Optical Network (SONET) or Synchronous Digital Hierarchy (SDH) networks
Enable error-disable for all possible causes

30. What is the timer range for automatic re-enabling of error-disabled ports?
From 30 seconds to 86 -400 seconds (24 hours)
Layer 2 source and destination MAC addresses; Layer 3 Time-To-Live (TTL) value and header checksum
A switch port that has been shut down automatically due to a serious error condition
Switch(config)#errdisable detect cause psecure-violation

31. What are the administrative modes of Layer 2 switched interfaces?
Switch#show interfaces status err-disabled
The adjacency table
Static access - trunk - tunnel or dynamic
IEEE 802.3z

32. Displays the entire Forwarding Information Base (FIB)
SVI or native routed interface
Switch(config)#errdisable detect cause arp-inspection
Switch#show ip cef
Switch(config-if)#duplex {auto | full | half}

33. What happens when autonegotiating of link duplex mode fails on a Fast Ethernet link?
Static access or trunk
The switch port falls back to default setting of half duplex
SVI or native routed interface
Switch(config)#no ip cef

34. What is Cisco's old recommendation regarding switch port speed and duplex mode?
Switch(config)#errdisable recovery interval {seconds}
Switch#clear mac address-table [dynamic] [address {mac-address}] [interface {interface}] [vlan {vlan}]
Configure the appropriate values manually on both ends of the link
A switch port that has been shut down automatically due to a serious error condition

35. What is 10GBASE-X?
400 metres half duplex and 2000 metres full duplex
Switch(config)#errdisable detect cause pagp-flap
Cabling specifications for 10 Gigabit Ethernet
10GBASE-SR/SW - 10GBASE-LR/LW - 10GBASE-ER/EW - 10GBASE-LX4/LW4 - 10GBASE-CX4

36. When should CEF be disabled?
Enable error-disable for all possible causes
Only temporarily for debugging purposes
From 30 seconds to 86 -400 seconds (24 hours)
On

37. How do Layer 2 switches provide isolation between hosts?
Switch(config)#default interface {interface}
Per port collision domains; Full duplex mode; Dedicated bandwidth; Error detection; Broadcast thresholds; Intelligent filtering and forwarding
300 seconds
Switch(config-if)#no ip route-cache cef

38. What is unknown unicast flooding?
Flooding a frame with unknown destination MAC address out all ports assigned to the source port VLAN except the source port itself
Forwarding Information Base
Interconnecting with existing Synchronous Optical Network (SONET) or Synchronous Digital Hierarchy (SDH) networks
Incomplete adjacency; Incomplete ARP resolution; Unsupported packet features; ICMP redirect; Packets destined to the router itself; IP options present; Access list evaluation failure; Fragmentation failure

39. What is the default timer for automatic re-enabling of error-disabled ports?
Layer 2 source and destination MAC addresses; Layer 3 Time-To-Live (TTL) value and header checksum
Trunk
300 seconds
Switch#show interfaces status err-disabled

40. Displays dynamic CAM table entries
Switch(config)#errdisable detect cause psecure-violation
Switch(config)#errdisable detect cause {all | {cause-name}}
Switched virtual interface (SVI)
Switch#show mac address-table dynamic [address {mac-address}] [interface {interface}] [vlan {vlan}]

41. What is the prerequesite for creating a working SVI?
Only temporarily for debugging purposes
Switch(config)#errdisable detect cause dhcp-rate-limit
Creating the VLAN
Static access

42. Enables error-disable detection
Switch(config)#errdisable detect cause {all | {cause-name}}
Institute of Electrical and Electronics Engineers
The table of learned MAC addresses - ports - and VLAN information
550 metres for 50 or 62.5 micron MMF; 10 km for 9 micron SMF

43. What is the default duplex mode of a Gigabit Ethernet interface?
25 metres
From 30 seconds to 86 -400 seconds (24 hours)
Manually by administratively disabling and re-enabling the port
Full duplex

44. Displays interface configuration information
Switch#show mac address-table dynamic [address {mac-address}] [interface {interface}] [vlan {vlan}]
Switch(config)#interface {type}{module}/{number}
Fast Ethernet over 2 pairs EIA/TIA Category 3 - 4 - 5 UTP
Switch#show running-config interface {interface}

45. What are the types of layer 3 switched interfaces
Switch(config)#define interface-range {macro-name} {type} {module}/{number} [- {number}] [ - {type} {module}/{number} ...]
400 metres half duplex and 2000 metres full duplex
CEF punt
SVI or native routed interface

46. Enables error-disable for Bridge Protocol Data Units (BPDU) received on ports configured for STP PortFast
Wide-Wavelength Division Multiplexing
40 km
Switch(config)#errdisable detect cause bpduguard
When there are more access list entries and Layer 4 operations than available Mask/Value and LOU entries

47. What is the operational mode of a switch port that carries transparent Layer 2 VPNs?
Only temporarily for debugging purposes
10 Gigabit Ethernet over 9 micron SMF (1550 nm serial laser)
Tunnel
Switch(config)#default interface {interface}

48. What is 1000BASE-CX?
Logical Operation Unit
Gigabit Ethernet over 1 pair Shielded Twisted Pair (STP) cabling
Switch#clear mac address-table [dynamic] [address {mac-address}] [interface {interface}] [vlan {vlan}]
A station must wait its turn to transmit; it can't transmit and receive at the same time

49. Enables error-disable for errors with Layer 2 Protocol Tunnelling
300 seconds
Static access or trunk
100 metres
Switch(config)#errdisable detect cause l2ptguard

50. What are the common PMD types for 10 Gigabit Ethernet?
S = Short; L = Long; E = Extra-long
10GBASE-SR/SW - 10GBASE-LR/LW - 10GBASE-ER/EW - 10GBASE-LX4/LW4 - 10GBASE-CX4
Gigabit Ethernet over 1 pair 50 or 62.5 micron MMF (850 nm laser)
The Layer 3 forwarding engine