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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. Disables CEF operation on an interface
70 km for 9 micron SMF; 100 km for 8 micron SMF
Compiling Access Control Entries (ACE) into the TCAM table
300 seconds
Switch(config-if)#no ip route-cache cef

2. What is 1000BASE-X?
Switch#show ip cef
Accelerated CEF (aCEF)
Cabling specifications for Gigabit Ethernet
Switch#show ip cef {network} [{mask}] [longer-prefixes] [detail]

3. What is the operational mode of a switch port that carries traffic for multiple VLANs?
Content-Addressable Memory
Packets that have been truncated before they were fully received
Trunk
Switch(config)#errdisable detect cause arp-inspection

4. What CEF adjacency is used when packets must be sent to the Layer 3 engine for further processing?
GBIC-to-GBIC connection between stacking Catalyst switches or between any two Gigabit switch ports over a short distance
10 Gigabit Ethernet over 9 micron SMF (1310 nm serial laser)
The Punt adjacency
Mask bits set to 1 for Value bits of interest and 0 for Value bits that don't matter

5. What is LAN PHY used for?
Interconnecting switches in a campus network
GBIC-to-GBIC connection between stacking Catalyst switches or between any two Gigabit switch ports over a short distance
Accelerated CEF (aCEF) and Distributed CEF (dCEF)
Gigabit Interface Converter (GBIC) or Small Form factor Pluggable (SFP)

6. What tables are maintained by the CEF Layer 3 forwarding engine?
A switch port that has been shut down automatically due to a serious error condition
Switch#show cef drop
FIB with adjacency table
Mask bits set to 1 for Value bits of interest and 0 for Value bits that don't matter

7. Enables error-disable for when the port link state is flapping between the up and down states
Switch(config)#errdisable detect cause channel-misconfig
10 Gigabit Ethernet over 9 micron SMF (1310 nm serial laser)
Switch(config)#errdisable detect cause link-flap
Switch(config-if)#description {string}

8. Displays the contents of the CAM table
25 metres
Half duplex
Switch#show mac address-table [address {mac-address}] [interface {interface}] [vlan {vlan}]
Switch(config-if)#no switchport

9. Displays entries in the Forwarding Information Base (FIB) for a specific subnet
Half duplex
Switch#show errdisable recovery
Wide-Wavelength Division Multiplexing
Switch#show ip cef {network} [{mask}] [longer-prefixes] [detail]

10. Adds a static entry to the MAC address table
The Layer 3 engine
Native routed interface
Switch(config)#mac address-table static {mac-address} vlan {vlan} interface {interface}
When there are more access list entries and Layer 4 operations than available Mask/Value and LOU entries

11. Enables error-disable for the presence of invalid GBIC or SFP modules
Institute of Electrical and Electronics Engineers
40 km
Carrier Sense Multiple Access Collision Detection
Switch(config)#errdisable detect cause gbic-invalid

12. What are the 100BASE-FX connectors used in Cisco Catalyst switches?
Switch(config)#errdisable detect cause dtp-flap
Static access
SC or MT-RJ
Switch#show adjacency [{interface}] [summary | detail]

13. What happens when autonegotiating of link duplex mode fails on a Fast Ethernet link?
The table of learned MAC addresses - ports - and VLAN information
The switch port falls back to default setting of half duplex
Switch(config-if)#description {string}
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

14. How is the TCAM organised?
By Mask/Value - where each unique mask has eight value patterns associated with it
On
300 metres for 50 or 62.5 micron MMF; 10 km for 9 micron SMF
Fast Ethernet over 2 pairs EIA/TIA Category 5 UTP

15. Removes entries from the CAM table
A station must wait its turn to transmit; it can't transmit and receive at the same time
Switch#clear mac address-table [dynamic] [address {mac-address}] [interface {interface}] [vlan {vlan}]
They are dropped (ARP throttling)
Switch#show errdisable recovery

16. What is the operational mode of a switch port that is a member of one VLAN?
Switch(config)#errdisable detect cause l2ptguard
Source IPX network (/32); Destination IPX network (/32); Destination node (/48); IPX packet type (/16)
Static access
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

17. What are the reasons for packets being dropped by CEF?
SC or MT-RJ
Content-Addressable Memory
Off
Encapsulation failure; Unresolved address; Unsupported protocol; No valid route; No valid adjacency; Checksum error

18. What is the maximum cabling distance for 10GBASE-LR/LW?
10 km
Process the first packet in a traffic flow to determine the destination
Switch(config)#errdisable detect cause pagp-flap
Switch(config)#errdisable detect cause gbic-invalid

19. What information is stored in TCAM?
Switch(config-if)#description {string}
Security and QoS ACLs
Switch(config)#define interface-range {macro-name} {type} {module}/{number} [- {number}] [ - {type} {module}/{number} ...]
Creating the VLAN

20. Creates a switched virtual interface (SVI) and enters interface configuration mode
Switch(config)#interface vlan {vlan-id}
Switch(config)#errdisable detect cause gbic-invalid
Source IPX network (/32); Destination IPX network (/32); Destination node (/48); IPX packet type (/16)
Encapsulation failure; Unresolved address; Unsupported protocol; No valid route; No valid adjacency; Checksum error

21. What is the standard for Gigabit Ethernet (1000 Mbps)?
Gigabit Ethernet over 1 pair 8 or 9 micron SMF (1550 nm laser)
Gigabit Ethernet over 1 pair Shielded Twisted Pair (STP) cabling
IEEE 802.3z
15 metres

22. What are the administrative modes of Layer 2 switched interfaces?
Ternary Content-Addressable Memory
SC or MT-RJ
Static access - trunk - tunnel or dynamic
Switch(config)#errdisable detect cause storm-control

23. Changes an interface to a layer 3 interface and erases all layer 2 interface configurations
Forwarding Information Base
Switch(config-if)#no switchport
IEEE 802.3ab
100 metres

24. What is the maximum cabling distance for Fast Ethernet over singlemode fibre?
10 km
A three-fold combination of 0 - 1 and X (don't care)
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
By Mask/Value - where each unique mask has eight value patterns associated with it

25. What Ethernet ports allow for autonegotiation?
Process the first packet in a traffic flow to determine the destination
IEEE 802.3z
70 km for 9 micron SMF; 100 km for 8 micron SMF
UTP Fast Ethernet and Gigabit Ethernet

26. What is the name of the CEF engine that maintains routing information in software?
Security and QoS ACLs
Creating the VLAN
The Layer 3 engine
Carrier Sense Multiple Access Collision Detection

27. What is the administrative mode of a switch port that uses DTP to negotiate its operational mode?
Fast Ethernet over 2 pairs EIA/TIA Category 3 - 4 - 5 UTP
Dynamic
The Layer 3 engine
With a mask value in addition to binary values to decide which keys in a table are relevant

28. Displays error-disabled detection status
Switch#show errdisable detect
10 km
Switch(config)#errdisable detect cause vmps
The table of learned MAC addresses - ports - and VLAN information

29. When are mode-conditioning patch leads required with 1000BASE-LX/LH transceivers?
Value - Mask - and Result (VMR)
10 Gigabit Ethernet over 50 or 62.5 micron MMF or 9 micron SMF (1300 nm WWDM laser)
Gigabit Ethernet over 1 pair Shielded Twisted Pair (STP) cabling
With MMF cables shorter than 100 metres (to prevent over-driving the far-end receiver) and with MMF cables longer than 300 metres (to lessen the effect of differential mode delay)

30. What is the name of physical network segment where data packets can collide with one another when being sent?
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
Gigabit Ethernet over 1 pair 50 or 62.5 micron MMF (850 nm laser)
Collision domain
15 metres

31. What is the maximum cabling distance for 10GBASE-ER/EW?
40 km
From 30 seconds to 86 -400 seconds (24 hours)
They are dropped (ARP throttling)
Numeric values that represent what action to take after the TCAM lookup occurs

32. What is the operational mode of a switch port that uses DTP negotiation?
Switch(config)#errdisable recovery interval {seconds}
A proprietary connector with a high-data-rate copper cable with enhanced signal integrity and EMI performance
Switch(config)#errdisable detect cause link-flap
Static access or trunk

33. What is ANSI?
A name assigned to a ranges of interfaces
Switch#show errdisable recovery
Mask bits set to 1 for Value bits of interest and 0 for Value bits that don't matter
American National Standards Institute

34. What is 100BASE-T2?
Fast Ethernet over 2 pairs EIA/TIA Category 3 - 4 - 5 UTP
Gigabit Ethernet over 1 pair 50 or 62.5 micron MMF or 9 micron SMF (1300 nm laser)
Forwarding Information Base
Ingress queueing; Destination MAC lookup (CAM); Security ACL lookup (TCAM); QoS ACL lookup (TCAM); Egress queueing

35. What is the state of packets that are sent to the CEF Layer 3 engine because of missing Layer 2 next-hop addresses?
IEEE 802.3z
100 metres
CEF punt
CEF glean

36. What RJ-45 pins must be swapped in a Category 5 UTP crossover cable for Gigabit Ethernet?
Only temporarily for debugging purposes
10 Gigabit Ethernet over 9 micron SMF (1550 nm serial laser)
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
Switch(config-if)#no switchport

37. What portion of the FIB contains the Layer 3 next-hop addresses for each entry together with the corresponding Layer 2 information?
Source MAC address; Port of arrival; VLAN; Time stamp
The adjacency table
Full duplex if only one of the two stacking connectors is used; Half duplex over a shared bus if if both connectors are used
SVI or native routed interface

38. What is the administrative mode of a switch port that carries transparent Layer 2 VPNs?
Source IP (/32); Destination IP (/32); Protocol (/16); ICMP code (/8); ICMP type (/4); IP type of service (ToS) (/8)
Tunnel
Security and QoS ACLs
70 km for 9 micron SMF; 100 km for 8 micron SMF

39. Displays switch port information for a specified interface
Switch(config)#errdisable detect cause loopback
With a mask value in addition to binary values to decide which keys in a table are relevant
Switch#show interfaces {interface} switchport
550 metres for 50 or 62.5 micron MMF; 10 km for 9 micron SMF

40. Sets the duplex mode of an Ethernet or Fast Ethernet interface
Source MAC (/48); Destination MAC (/48); Ethertype (/16)
Static access or dynamic
With a mask value in addition to binary values to decide which keys in a table are relevant
Switch(config-if)#duplex {auto | full | half}

41. What is the content of TCAM Result entries?
Gigabit Ethernet over 1 pair 50 or 62.5 micron MMF (850 nm laser)
Switch#show errdisable detect
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
Numeric values that represent what action to take after the TCAM lookup occurs

42. What is 100BASE-FX?
XENPAK - X2 - or SFP+
Bundling together two to eight full duplex Fast Ethernet links to act as a single physical link
1 -2 on one end with 3 -6 on the other end
Fast Ethernet over 62.5/125 micron multimode fibre (MMF) or 9 micron singlemode fibre (SMF)

43. Displays static CAM table entries
Switch(config)#errdisable detect cause arp-inspection
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#show mac address-table static [address {mac-address}] [interface {interface}] [vlan {vlan}]
IEEE 802.3ab

44. What is 1000BASE-SX?
Switch#show interfaces {interface}
400 metres half duplex and 2000 metres full duplex
Gigabit Ethernet over 1 pair 50 or 62.5 micron MMF (850 nm laser)
Interconnecting switches in a campus network

45. What is the name of a Layer 3 logical interface on a switch that represents an entire VLAN?
Source IPX network (/32); Destination IPX network (/32); Destination node (/48); IPX packet type (/16)
SVI
Switch#show mac address-table static [address {mac-address}] [interface {interface}] [vlan {vlan}]
Route caching and topology based

46. Enables error-disable detection
Switch(config)#errdisable detect cause {all | {cause-name}}
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
Switch(config)#errdisable detect cause rootguard
Enable error-disable for all possible causes

47. What RJ-45 pins have been swapped in a Category 5 UTP crossover cable for Fast Ethernet?
Switch#show running-config interface {interface}
1 -2 on one end with 3 -6 on the other end
The switch port falls back to default setting of half duplex
Compiling Access Control Entries (ACE) into the TCAM table

48. What is MLS?
SC or MT-RJ
Multilayer Switching
10 Gigabit Ethernet over 9 micron SMF (1550 nm serial laser)
Switch(config-if)#no switchport

49. What is the DTP negotiation mode of a switch port configured as static access?
Gigabit Ethernet over 1 pair 8 or 9 micron SMF (1550 nm laser)
Cabling specifications for Gigabit Ethernet
Full duplex if only one of the two stacking connectors is used; Half duplex over a shared bus if if both connectors are used
Off

50. What are the Gigabit Ethernet autonegotiation selection priorities?
Fast Ethernet over 62.5/125 micron multimode fibre (MMF) or 9 micron singlemode fibre (SMF)
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
1000BASE-T full duplex followed by 1000BASE-T half duplex
CEF punt