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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 is the administrative mode of a switch port that is a member of one VLAN?
S = Short; L = Long; E = Extra-long
Static access or dynamic
Route caching and topology based
Switch(config)#interface vlan {vlan-id}

2. What is 10BASE-T?
Switch(config)#no ip cef
550 metres for 50 or 62.5 micron MMF; 10 km for 9 micron SMF
Cabling specification for 10 Mbps Ethernet over Unshielded Twisted Pair (UTP) cabling
100 metres

3. Disables a switch port
Switch#show errdisable detect
Switch(config-if)#shutdown
Enable error-disable for all possible causes
A switch port that has been shut down automatically due to a serious error condition

4. What is the administrative mode of a switch port that carries transparent Layer 2 VPNs?
Switch(config)#no ip cef
Source MAC (/48); Destination MAC (/48); Ethertype (/16)
LAN PHY and WAN PHY
Tunnel

5. What is the maximum cabling distance for 1000BASE-ZX?
Switch(config)#errdisable detect cause link-flap
Switch#show interfaces status
American National Standards Institute
70 km for 9 micron SMF; 100 km for 8 micron SMF

6. What is the default duplex mode of a 10 Mbps Ethernet interface?
Trunk
Switch(config)#mac address-table aging-time {seconds}
Switch(config)#interface range macro {name}
Half duplex

7. Displays switch port information for a specified interface
Per port collision domains; Full duplex mode; Dedicated bandwidth; Error detection; Broadcast thresholds; Intelligent filtering and forwarding
Switch(config)#errdisable recovery cause {all | {cause-name}}
Switch#show interfaces {interface} switchport
Static access

8. What CEF adjacency is used to discard packets because of access list or other policy action?
Switch(config)#errdisable detect cause security-violation
IEEE 802.3ae
The Discard adjacency
Process the first packet in a traffic flow to determine the destination

9. Enables error-disable when a link is seen to be unidirectional
Switch(config)#errdisable detect cause gbic-invalid
The Discard adjacency
Switch(config)#errdisable detect cause udld
CEF punt

10. What is the TCAM Value and Mask for an IPX access list?
Source IPX network (/32); Destination IPX network (/32); Destination node (/48); IPX packet type (/16)
In parallel revealing the best (longest) match in a single table lookup
Electromagnetic Interference
Source IP (/32) - Destination IP (/32) - Protocol (/16) - IP ToS (/8) - Source port (/16) - Source operator (/4) - Destination port (/16) - Destination operator (/4)

11. Displays CEF Punt statistics with number of packets and reason for each line card
1 -2 on one end with 3 -6 on the other end
Collision domain
Switch#show cef not-cef-switched
Full duplex only

12. What is Fast EtherChannel (FEC)?
Bundling together two to eight full duplex Fast Ethernet links to act as a single physical link
Cabling specification for 10 Mbps Ethernet over Unshielded Twisted Pair (UTP) cabling
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
Fast Ethernet over 2 pairs EIA/TIA Category 3 - 4 - 5 UTP

13. What is the DTP negotiation mode of a switch port configured as dynamic?
A name assigned to a ranges of interfaces
25 metres
Static access or trunk
On

14. Enables error-disable for Bridge Protocol Data Units (BPDU) received on ports configured for STP PortFast
When one station transmits at the same time as another on a shared medium
Logical Operation Unit
Switch#show errdisable detect
Switch(config)#errdisable detect cause bpduguard

15. What is 1000BASE-ZX?
Switch#show mac address-table static [address {mac-address}] [interface {interface}] [vlan {vlan}]
Through exchange of information - which means that for one end to successfully negotiate duplex mode the other end must also be set to autonegotiate
Tunnel
Gigabit Ethernet over 1 pair 8 or 9 micron SMF (1550 nm laser)

16. Displays static CAM table entries
Switch(config)#errdisable detect cause arp-inspection
Enable error-disable for all possible causes
Switch#show mac address-table static [address {mac-address}] [interface {interface}] [vlan {vlan}]
Switch(config)#errdisable recovery interval {seconds}

17. What is 1000BASE-LX/LH?
Gigabit Ethernet over 1 pair 50 or 62.5 micron MMF or 9 micron SMF (1300 nm laser)
66-300 metres for 50 micron MMF; 33 metres for 62.5 micron MMF
10 Gigabit Ethernet over copper CX4 with Infiniband connectors
Wide-Wavelength Division Multiplexing

18. Sets the administrative mode of a switch port to access
Switch(config)#interface range {type}{module}/{number} [- {number}] [ - {type}{module}/{number} ...]
Static access - trunk - tunnel or dynamic
Switch(config-if)#switchport mode access
UTP Fast Ethernet and Gigabit Ethernet

19. What is FIB?
Forwarding Information Base
Switch(config-if)#description {string}
Switch#clear mac address-table [dynamic] [address {mac-address}] [interface {interface}] [vlan {vlan}]
The Layer 3 forwarding engine

20. What are the Fast Ethernet autonegotiation selection priorities?
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
Switch(config)#errdisable detect cause vmps
Switch(config)#errdisable detect cause pagp-flap
XENPAK - X2 - or SFP+

21. What is CEF?
Switch(config)#no ip cef
They are dropped (ARP throttling)
Cisco Express Forwarding
IEEE 802.3ae

22. What Ethernet ports allow for autonegotiation?
Static access - trunk - tunnel or dynamic
Gigabit Ethernet over 4 pairs EIA/TIA Category 5 UTP
UTP Fast Ethernet and Gigabit Ethernet
IEEE 802.3ae

23. What is the maximum cabling distance for 1000BASE-CX?
25 metres
10 km
They are dropped (ARP throttling)
Fast Ethernet over 4 pairs EIA/TIA Category 3 - 4 - 5 UTP

24. What are the operational modes of a Layer 2 switched interface?
Source IP (/32) - Destination IP (/32) - Protocol (/16) - IP ToS (/8) - Source port (/16) - Source operator (/4) - Destination port (/16) - Destination operator (/4)
The Layer 3 engine
Down - static access - trunk or tunnel
Interconnecting with existing Synchronous Optical Network (SONET) or Synchronous Digital Hierarchy (SDH) networks

25. What is 10GBASE-ER/EW?
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
Per port collision domains; Full duplex mode; Dedicated bandwidth; Error detection; Broadcast thresholds; Intelligent filtering and forwarding
10 Gigabit Ethernet over 9 micron SMF (1550 nm serial laser)
Dynamic

26. What are the administrative modes of Layer 2 switched interfaces?
Static access - trunk - tunnel or dynamic
Entry not in FIB; FIB table full; IP TTL expired; MTU exceeded; ICMP redirect; Unsupported encapsulation; Tunnelled packets requiring compression or encryption; Access list with 'log' option; NAT must be performed
When the Spanning Tree Protocol (STP) has put the switch port in learning or forwarding state
CEF glean

27. 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
UTP Fast Ethernet and Gigabit Ethernet
Switch(config-if)#shutdown
FIB with adjacency table

28. What information is stored in CAM?
The table of learned MAC addresses - ports - and VLAN information
Switch#show errdisable detect
Switch#show mac address-table count [address {mac-address}] [interface {interface}] [vlan {vlan}]
Cabling specifications for Gigabit Ethernet

29. What is 1000BASE-SX?
Gigabit Ethernet over 1 pair 50 or 62.5 micron MMF (850 nm laser)
Full duplex only
Accelerated CEF (aCEF) and Distributed CEF (dCEF)
Feature Manager (FM) and Switching Database Manager (SDM)

30. Displays dynamic CAM table entries
Switch(config)#errdisable detect cause ilpower
LOU registers
Switch#show mac address-table dynamic [address {mac-address}] [interface {interface}] [vlan {vlan}]
Switch(config-if)#duplex {auto | full | half}

31. What are the common cabling specifications for Gigabit Ethernet?
Fast Ethernet over 4 pairs EIA/TIA Category 3 - 4 - 5 UTP
Switch(config-if)#no switchport
1000BASE-CX - 1000BASE-T - 1000-BASE-SX - 1000-BASE-LX/LH and 1000-BASE-ZX
XENPAK - X2 - or SFP+

32. What CEF optimisation technique cache FIB entries in switch line cards?
Cabling specifications for 10 Gigabit Ethernet
Static access or dynamic
Accelerated CEF (aCEF)
Carrier Sense Multiple Access Collision Detection

33. Selects a switch port interface and enters interface configuration mode
The CEF epoch number
Switch(config-if)#no switchport
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(config)#interface {type}{module}/{number}

34. What is LOU?
Gigabit Ethernet over 1 pair 50 or 62.5 micron MMF or 9 micron SMF (1300 nm laser)
10 Gigabit Ethernet over copper CX4 with Infiniband connectors
Logical Operation Unit
SC or MT-RJ

35. Selects an interface-range macro and enters interface configuration mode
Switch(config)#interface range macro {name}
LC - MT-RJ or RJ-45
Switch#show interfaces {interface}
275 metres for 62.5 micron MMF; 550 metres for 50 micron MMF

36. What is a SVI?
Stations can transmit and receive at the same time because switched Ethernet removes the possibility of collisions
Switched virtual interface (SVI)
Logical Operation Unit
IEEE 802.3u

37. Enables error-disable for misconfiguration of EtherChannel bundles
550 metres for 50 or 62.5 micron MMF; 10 km for 9 micron SMF
Switch(config-if)#description {string}
Switch(config)#errdisable detect cause channel-misconfig
The Layer 3 forwarding engine

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

39. What is the TCAM Value and Mask for an ICMP access list?
Source IP (/32); Destination IP (/32); Protocol (/16); ICMP code (/8); ICMP type (/4); IP type of service (ToS) (/8)
UTP Fast Ethernet and Gigabit Ethernet
CEF punt
Entry not in FIB; FIB table full; IP TTL expired; MTU exceeded; ICMP redirect; Unsupported encapsulation; Tunnelled packets requiring compression or encryption; Access list with 'log' option; NAT must be performed

40. What are the basic operations that a frame undergoes as it passes through a multilayer switch?
Source IP (/32) - Destination IP (/32) - Protocol (/16) - IP ToS (/8) - Source port (/16) - Source operator (/4) - Destination port (/16) - Destination operator (/4)
Switch(config)#errdisable detect cause arp-inspection
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
Ingress queueing; Destination MAC lookup (CAM); Destination IP lookup (FIB); Security ACL lookup (TCAM); QoS ACL lookup (TCAM); Layer 3 packet rewrite; Egress queueing

41. When should CEF be disabled?
10 Gigabit Ethernet over 50 or 62.5 micron MMF (850 nm serial laser)
Switch(config)#errdisable detect cause l2ptguard
Numeric values that represent what action to take after the TCAM lookup occurs
Only temporarily for debugging purposes

42. What is 1000BASE-T?
IEEE 802.3ae
Gigabit Ethernet over 4 pairs EIA/TIA Category 5 UTP
Switch(config)#errdisable detect cause gbic-invalid
SVI

43. What is the name of the CEF engine that maintains routing information in software?
Mask bits set to 1 for Value bits of interest and 0 for Value bits that don't matter
The Layer 3 engine
When one station transmits at the same time as another on a shared medium
Gigabit Ethernet over 4 pairs EIA/TIA Category 5 UTP

44. What is the maximum cabling distance for 1000BASE-LX/LH?
550 metres for 50 or 62.5 micron MMF; 10 km for 9 micron SMF
10 Gigabit Ethernet over 50 or 62.5 micron MMF (850 nm serial laser)
Switch#show errdisable recovery
American National Standards Institute

45. Enables error-disable for errors related to 802.1x security
Switch#show running-config interface {interface}
Switch(config-if)#no switchport
Source MAC address; Port of arrival; VLAN; Time stamp
Switch(config)#errdisable detect cause security-violation

46. What are the types of layer 3 switched interfaces
Creating the VLAN
Trunk or dynamic
Packets that have been truncated before they were fully received
SVI or native routed interface

47. How do Layer 2 switches provide isolation between hosts?
Switch(config-if)#switchport access vlan {vlan}
Off
Manually by administratively disabling and re-enabling the port
Per port collision domains; Full duplex mode; Dedicated bandwidth; Error detection; Broadcast thresholds; Intelligent filtering and forwarding

48. What happens when autonegotiating of link duplex mode fails on a Fast Ethernet link?
70 km for 9 micron SMF; 100 km for 8 micron SMF
The switch port falls back to default setting of half duplex
Value - Mask - and Result (VMR)
Switch#show errdisable detect

49. What CEF optimisation replicates the entire FIB table among switch line cards?
A switch port that has been shut down automatically due to a serious error condition
IEEE 802.3ab
Distributed CEF (dCEF)
66-300 metres for 50 micron MMF; 33 metres for 62.5 micron MMF

50. Displays administrative and operational status for a specified interface
Mask bits set to 1 for Value bits of interest and 0 for Value bits that don't matter
LC - MT-RJ or RJ-45
Switch#show interfaces {interface}
Through exchange of information - which means that for one end to successfully negotiate duplex mode the other end must also be set to autonegotiate