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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 are the reasons for packets being dropped by CEF?
Encapsulation failure; Unresolved address; Unsupported protocol; No valid route; No valid adjacency; Checksum error
Switch#show interfaces status
Electromagnetic Interference
Only temporarily for debugging purposes

2. Disables a switch port
Switch(config-if)#shutdown
10GbE operates only at full duplex
Wide-Wavelength Division Multiplexing
Switch(config)#errdisable detect cause ilpower

3. What is the content of TCAM Mask entries?

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4. Enables error-disable for conditions that trigger port security configured on a port
10 km
Switch(config)#errdisable detect cause psecure-violation
A name assigned to a ranges of interfaces
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

5. What is the TCAM Value and Mask for an IP access list?
Switch(config)#errdisable detect cause gbic-invalid
Source IP (/32); Destination IP (/32); Protocol (/16); IP ToS (/8)
The CEF epoch number
Switch#show ip cef

6. What CEF optimisation replicates the entire FIB table among switch line cards?
LOU registers
10 Gigabit Ethernet over 50 or 62.5 micron MMF (850 nm serial laser)
Distributed CEF (dCEF)
10 km

7. Sets the duplex mode of an Ethernet or Fast Ethernet interface
Switched virtual interface (SVI)
Switch(config-if)#duplex {auto | full | half}
Full duplex
Dynamic

8. What CEF adjacency is used when packets must be sent to the Layer 3 engine for further processing?
Adjacent MAC address (6 octets); Layer 3 engine MAC address (6 octets); EtherType (2 octets)
Switch#clear mac address-table [dynamic] [address {mac-address}] [interface {interface}] [vlan {vlan}]
The Punt adjacency
Switch#show interfaces {interface} switchport

9. What is the content of TCAM Result entries?
Numeric values that represent what action to take after the TCAM lookup occurs
On
Gigabit Ethernet over 1 pair Shielded Twisted Pair (STP) 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

10. What connectors can be used with GBIC modules?
Switch(config-if)#description {string}
SC fibre optic or RJ-45 UTP
Switch(config)#interface range macro {name}
From 30 seconds to 86 -400 seconds (24 hours)

11. What is the default timer for automatic re-enabling of error-disabled ports?
Enable error-disable for all possible causes
Switch#show mac address-table dynamic [address {mac-address}] [interface {interface}] [vlan {vlan}]
Fast Ethernet over 2 pairs EIA/TIA Category 3 - 4 - 5 UTP
300 seconds

12. What are the basic operations that a frame undergoes as it passes through a Layer 2 switch?
The Discard adjacency
Ingress queueing; Destination MAC lookup (CAM); Security ACL lookup (TCAM); QoS ACL lookup (TCAM); Egress queueing
Switch(config)#errdisable detect cause gbic-invalid
IEEE 802.3ae

13. What is the DTP negotiation mode of a switch port configured as trunk?
300 metres for 50 or 62.5 micron MMF; 10 km for 9 micron SMF
IEEE 802.3u
Gigabit Ethernet over 1 pair 50 or 62.5 micron MMF or 9 micron SMF (1300 nm laser)
On

14. What is the original standard for Ethernet (10 Mbps)?
Switch#show mac address-table count [address {mac-address}] [interface {interface}] [vlan {vlan}]
Gigabit Ethernet over 1 pair 8 or 9 micron SMF (1550 nm laser)
IEEE 802.3
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

15. What is 10GBASE-CX4?
10 Gigabit Ethernet over copper CX4 with Infiniband connectors
Gigabit Ethernet over 1 pair 50 or 62.5 micron MMF (850 nm laser)
Full duplex
Cabling specification for 10 Mbps Ethernet over Unshielded Twisted Pair (UTP) cabling

16. What is the standard for Gigabit Ethernet (1000 Mbps)?
IEEE 802.3z
Compiling Access Control Entries (ACE) into the TCAM table
Forwarding Information Base
Cisco Express Forwarding

17. What is the default age-out time for stale entries in the CAM table?
Ingress queueing; Destination MAC lookup (CAM); Destination IP lookup (FIB); Security ACL lookup (TCAM); QoS ACL lookup (TCAM); Layer 3 packet rewrite; Egress queueing
300 seconds
Switch(config-if)#switchport mode access
When there are more access list entries and Layer 4 operations than available Mask/Value and LOU entries

18. What is the maximum cabling distance for 1000BASE-ZX?
70 km for 9 micron SMF; 100 km for 8 micron SMF
Source IPX network (/32); Destination IPX network (/32); Destination node (/48); IPX packet type (/16)
10GbE operates only at full duplex
Static access - trunk - tunnel or dynamic

19. Configures the maximum ageing time for entries in the MAC address table
Gigabit Ethernet over 1 pair 8 or 9 micron SMF (1550 nm laser)
IEEE 802.3
Switch(config)#errdisable recovery cause {all | {cause-name}}
Switch(config)#mac address-table aging-time {seconds}

20. Enables error-disable for errors when assigning a port to a dynamic VLAN through a VMPS
The switch port falls back to default setting of half duplex
Switch(config)#errdisable detect cause vmps
100 metres
The Layer 3 forwarding engine

21. What is the maximum cabling distance for 10GBASE-LX4/LW4?
Switch(config)#errdisable detect cause arp-inspection
XENPAK - X2 - or SFP+
Switch(config)#interface range {type}{module}/{number} [- {number}] [ - {type}{module}/{number} ...]
300 metres for 50 or 62.5 micron MMF; 10 km for 9 micron SMF

22. Enables error-disable for the presence of invalid GBIC or SFP modules
SC or MT-RJ
Switch#show mac address-table static [address {mac-address}] [interface {interface}] [vlan {vlan}]
LOU registers
Switch(config)#errdisable detect cause gbic-invalid

23. What is the maximum cabling distance for Fast Ethernet over singlemode fibre?
100BASE-TX - 100BASE-T2 - 100BASE-T4 and 100-BASE-FX
Switch(config)#errdisable detect cause security-violation
10 km
Switch(config-if)#duplex {auto | full | half}

24. What is the maximum cabling distance for 1000BASE-SX?
550 metres for 50 or 62.5 micron MMF; 10 km for 9 micron SMF
275 metres for 62.5 micron MMF; 550 metres for 50 micron MMF
The Drop adjacency
Switch#clear mac address-table [dynamic] [address {mac-address}] [interface {interface}] [vlan {vlan}]

25. What is the default duplex mode of a 10 Mbps Ethernet interface?
Switch(config)#errdisable detect cause dhcp-rate-limit
Half duplex
Tunnel
300 metres for 50 or 62.5 micron MMF; 10 km for 9 micron SMF

26. What is a GigaStack GBIC?
Switch(config)#errdisable detect cause psecure-violation
IEEE 802.3ae
A proprietary connector with a high-data-rate copper cable with enhanced signal integrity and EMI performance
10 Gigabit Ethernet over 50 or 62.5 micron MMF (850 nm serial laser)

27. What is the operational mode of a switch port that carries traffic for multiple VLANs?
10 Gigabit Ethernet over 9 micron SMF (1550 nm serial laser)
Switch(config)#mac address-table static {mac-address} vlan {vlan} interface {interface}
Trunk
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)

28. Enables automatic re-enabling of error-disabled ports
1000BASE-CX - 1000BASE-T - 1000-BASE-SX - 1000-BASE-LX/LH and 1000-BASE-ZX
100 metres
Switch(config)#errdisable recovery cause {all | {cause-name}}
Gigabit Ethernet over 1 pair 50 or 62.5 micron MMF (850 nm laser)

29. What are the letters used with 10GBASE-X two-letter suffixes to specify the PHY type?
R = LAN PHY; W = WAN PHY
Switch(config)#mac address-table aging-time {seconds}
275 metres for 62.5 micron MMF; 550 metres for 50 micron MMF
IEEE 802.3

30. Enables error-disable when trunking encapsulation is flapping from one type to another
IEEE 802.3
Switch(config-if)#duplex {auto | full | half}
Switch(config)#errdisable detect cause dtp-flap
Collision domain

31. What is the TCAM Value and Mask for an Ethernet access list?
In TCAM Value entries
IEEE 802.3u
Source MAC (/48); Destination MAC (/48); Ethertype (/16)
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

32. When do collisions occur?
Switch#show interfaces status
When one station transmits at the same time as another on a shared medium
Switch#show interfaces {interface}
275 metres for 62.5 micron MMF; 550 metres for 50 micron MMF

33. Enables error-disable for errors with offering inline power
Switch#show mac address-table count [address {mac-address}] [interface {interface}] [vlan {vlan}]
The Layer 3 engine
Switch(config)#errdisable detect cause ilpower
IEEE 802.3ab

34. What is the name of the CEF engine that forwards packets in hardware?
The Layer 3 forwarding engine
CEF punt
The Punt adjacency
Switch(config-if)#speed {10 | 100 | 1000 | auto}

35. What is a ternary combination?

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36. What is 100BASE-TX?
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
Fast Ethernet over 2 pairs EIA/TIA Category 5 UTP
Switch#show errdisable detect
Source MAC address; Port of arrival; VLAN; Time stamp

37. What are the reasons for packets being punted by CEF?
Ingress queueing; Destination MAC lookup (CAM); Security ACL lookup (TCAM); QoS ACL lookup (TCAM); Egress queueing
10 km
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
Cabling specification for 10 Mbps Ethernet over Unshielded Twisted Pair (UTP) cabling

38. How are ports that are in error-disable state re-enabled by default?
The Drop adjacency
Manually by administratively disabling and re-enabling the port
400 metres half duplex and 2000 metres full duplex
Value - Mask - and Result (VMR)

39. What CEF adjacency is used to switch packets destined for the null interface?
Adjacent MAC address (6 octets); Layer 3 engine MAC address (6 octets); EtherType (2 octets)
SVI or native routed interface
The Null adjacency
Fast Ethernet over 4 pairs EIA/TIA Category 3 - 4 - 5 UTP

40. Displays administrative and operational status for a specified interface
Switch#show interfaces {interface}
400 metres half duplex and 2000 metres full duplex
The adjacency table
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

41. What is the administrative mode of a switch port that carries transparent Layer 2 VPNs?
Switch#show ip cef {network} [{mask}] [longer-prefixes] [detail]
Tunnel
Switch#show interfaces status err-disabled
The CEF epoch number

42. Sets the administrative mode of a switch port to access
Switch(config)#errdisable detect cause channel-misconfig
On
Multilayer Switching
Switch(config-if)#switchport mode access

43. Displays static CAM table entries
Switch#show mac address-table static [address {mac-address}] [interface {interface}] [vlan {vlan}]
When one station transmits at the same time as another on a shared medium
Trunk or dynamic
Off

44. 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)
Feature Manager (FM) and Switching Database Manager (SDM)
1 -2 on one end with 3 -6 on the other end
Manually by administratively disabling and re-enabling the port

45. When can a switch start to learn source MAC addresses on incoming ports?
Switch#show interfaces status
The Discard adjacency
Static access - trunk - tunnel or dynamic
When the Spanning Tree Protocol (STP) has put the switch port in learning or forwarding state

46. Sets the speed of a Fast Ethernet or Gigabit Ethernet interface
Routing table and ARP table
66-300 metres for 50 micron MMF; 33 metres for 62.5 micron MMF
Switch(config-if)#speed {10 | 100 | 1000 | auto}
IEEE 802.3ab

47. What is Fast EtherChannel (FEC)?
Static access or dynamic
Down - static access - trunk or tunnel
By Mask/Value - where each unique mask has eight value patterns associated with it
Bundling together two to eight full duplex Fast Ethernet links to act as a single physical link

48. How is the TCAM organised?
1000BASE-CX - 1000BASE-T - 1000-BASE-SX - 1000-BASE-LX/LH and 1000-BASE-ZX
Electromagnetic Interference
By Mask/Value - where each unique mask has eight value patterns associated with it
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

49. What is 10GBASE-ER/EW?
Creating the VLAN
10 Gigabit Ethernet over 9 micron SMF (1550 nm serial laser)
Packets that have been truncated before they were fully received
Switch#show interfaces {interface}

50. What is a SVI?
Trunk or dynamic
10 Gigabit Ethernet over 9 micron SMF (1550 nm serial laser)
Switched virtual interface (SVI)
1 -2 on one end with 3 -6 on the other end