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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. Creates a switched virtual interface (SVI) and enters interface configuration mode
Switch(config)#interface vlan {vlan-id}
Switch#show interfaces status err-disabled
SVI
Source IP (/32); Destination IP (/32); Protocol (/16); ICMP code (/8); ICMP type (/4); IP type of service (ToS) (/8)

2. What type of packets can not be forwarded by CEF but are instead sent to the switch CPU for process switching in software?
1 -2 on one end with 3 -6 on the other end
Half duplex
275 metres for 62.5 micron MMF; 550 metres for 50 micron MMF
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

3. What is 10GBASE-LX4/LW4?
10 Gigabit Ethernet over 50 or 62.5 micron MMF or 9 micron SMF (1300 nm WWDM laser)
ANSI X3T11 FibreChannel
Adjacent MAC address (6 octets); Layer 3 engine MAC address (6 octets); EtherType (2 octets)
Cabling specifications for 10 Gigabit Ethernet

4. What fields are rewritten in hardware before a Layer 3 packet is switched to the to egress queue of a multilayer switch?
Layer 2 source and destination MAC addresses; Layer 3 Time-To-Live (TTL) value and header checksum
GBIC-to-GBIC connection between stacking Catalyst switches or between any two Gigabit switch ports over a short distance
By Mask/Value - where each unique mask has eight value patterns associated with it
10 km

5. How are packets marked before being sent to the CEF Layer 3 engine for further processing?
By electrical signalling so that either end of a link can determine what speed the other end is trying to use
Logical Operation Unit
The table of learned MAC addresses - ports - and VLAN information
CEF punt

6. What is EMI?
10 Gigabit Ethernet over 50 or 62.5 micron MMF (850 nm serial laser)
Electromagnetic Interference
Mask bits set to 1 for Value bits of interest and 0 for Value bits that don't matter
Switch(config)#errdisable detect cause security-violation

7. Adds a static entry to the MAC address table
Switch(config-if)#switchport mode access
Layer 2 source and destination MAC addresses; Layer 3 Time-To-Live (TTL) value and header checksum
Switch(config)#mac address-table static {mac-address} vlan {vlan} interface {interface}
1 -2 on one end with 3 -6 on the other end

8. Enables error-disable for the presence of invalid GBIC or SFP modules
Full duplex
Switch(config)#errdisable detect cause gbic-invalid
From 30 seconds to 86 -400 seconds (24 hours)
Gigabit Interface Converter (GBIC) or Small Form factor Pluggable (SFP)

9. What is 10GBASE-SR/SW?
A switch port that has been shut down automatically due to a serious error condition
Switch(config-if)#switchport access vlan {vlan}
Dynamic
10 Gigabit Ethernet over 50 or 62.5 micron MMF (850 nm serial laser)

10. What is the TCAM Value and Mask for an IGMP access list?
Switch(config-if)#description {string}
Full duplex only
Source IP (/32); Destination IP (/32); Protocol (/16); IP ToS (/8); IGMP message type (/8)
Cisco Express Forwarding

11. Enables error-disable when the Port Aggregation Protocol (PAgP) is flapping
Switch(config)#no ip cef
Switch#show cef drop
XENPAK - X2 - or SFP+
Switch(config)#errdisable detect cause pagp-flap

12. What information is stored in CAM?
The table of learned MAC addresses - ports - and VLAN information
Switch(config)#errdisable detect cause storm-control
Switch(config)#errdisable recovery interval {seconds}
CEF glean

13. What CEF adjacency is used to discard packets because of access list or other policy action?
The Discard adjacency
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
The Punt adjacency
300 seconds

14. What are the supported duplex mode settings for Gigabit Ethernet on Cisco switches?
Fast Ethernet over 4 pairs EIA/TIA Category 3 - 4 - 5 UTP
Packets that have been truncated before they were fully received
Source MAC (/48); Destination MAC (/48); Ethertype (/16)
Full duplex only

15. What is a SVI?
Switched virtual interface (SVI)
A proprietary connector with a high-data-rate copper cable with enhanced signal integrity and EMI performance
66-300 metres for 50 micron MMF; 33 metres for 62.5 micron MMF
Stations can transmit and receive at the same time because switched Ethernet removes the possibility of collisions

16. What is a GigaStack GBIC?
Source MAC (/48); Destination MAC (/48); Ethertype (/16)
A proprietary connector with a high-data-rate copper cable with enhanced signal integrity and EMI performance
From 30 seconds to 86 -400 seconds (24 hours)
Compiling Access Control Entries (ACE) into the TCAM table

17. Sets the administrative mode of a switch port to access
Switch(config-if)#switchport mode access
Cabling specifications for Gigabit Ethernet
Switch#show interfaces status err-disabled
1000BASE-T full duplex followed by 1000BASE-T half duplex

18. Enables error-disable for rate-limiting of DHCP snooping
Switch(config)#errdisable detect cause dhcp-rate-limit
Security and QoS ACLs
Logical Operation Unit
Full duplex if only one of the two stacking connectors is used; Half duplex over a shared bus if if both connectors are used

19. Enables error-disable for errors with Layer 2 Protocol Tunnelling
100BASE-TX - 100BASE-T2 - 100BASE-T4 and 100-BASE-FX
Layer 2 destination address changed to next-hop MAC address; Layer 2 source address changed to outbound interface MAC address; Layer 3 TTL decremented by 1; Layer 3 IP checksum recalculated; Layer 2 frame checksum recalculated
Switch(config)#errdisable detect cause l2ptguard
Switch#show ip cef {network} [{mask}] [longer-prefixes] [detail]

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

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21. What is the DTP negotiation mode of a switch port configured as trunk?
Slow response times - low throughput - runts and other input errors on the switch ports
On
Switch#show errdisable recovery
Static access - trunk - tunnel or dynamic

22. Where is source and destination addresses and other relevant protocol information for access lists stored in the TCAM table?
In TCAM Value entries
SC or MT-RJ
Switch(config)#errdisable detect cause bpduguard
Switch(config-if)#switchport access vlan {vlan}

23. Displays CEF Punt statistics with number of packets and reason for each line card
Switch(config)#errdisable detect cause vmps
Switch#show cef not-cef-switched
10 Gigabit Ethernet over 9 micron SMF (1550 nm serial laser)
300 metres for 50 or 62.5 micron MMF; 10 km for 9 micron SMF

24. Displays interface configuration information
400 metres half duplex and 2000 metres full duplex
Switch(config)#define interface-range {macro-name} {type} {module}/{number} [- {number}] [ - {type} {module}/{number} ...]
Switch#show running-config interface {interface}
10GBASE-SR/SW - 10GBASE-LR/LW - 10GBASE-ER/EW - 10GBASE-LX4/LW4 - 10GBASE-CX4

25. What mechanism does the TCAM provide for Layer 4 comparisons involving gt - lt - neq or range operators?
LOU registers
10 Gigabit Ethernet over 50 or 62.5 micron MMF (850 nm serial laser)
Switch(config)#interface range {type}{module}/{number} [- {number}] [ - {type}{module}/{number} ...]
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

26. What portion of the FIB contains the Layer 3 next-hop addresses for each entry together with the corresponding Layer 2 information?
Switch(config)#errdisable detect cause arp-inspection
Trunk
Switch(config)#errdisable detect cause link-flap
The adjacency table

27. What RJ-45 pins have been swapped in a Category 5 UTP crossover cable for Fast Ethernet?
Compiling Access Control Entries (ACE) into the TCAM table
1 -2 on one end with 3 -6 on the other end
By electrical signalling so that either end of a link can determine what speed the other end is trying to use
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

28. 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)
10 Gigabit Ethernet over copper CX4 with Infiniband connectors
Store-and-forward
Content-Addressable Memory

29. Enables error-disable detection
From 30 seconds to 86 -400 seconds (24 hours)
Switch(config)#errdisable detect cause {all | {cause-name}}
XENPAK - X2 - or SFP+
SC fibre optic or RJ-45 UTP

30. What is CEF?
Switch(config-if)#duplex {auto | full | half}
FIB with adjacency table
Fast Ethernet over 2 pairs EIA/TIA Category 3 - 4 - 5 UTP
Cisco Express Forwarding

31. What is the maximum cabling distance for 1000BASE-CX?
25 metres
Tunnel
1000BASE-CX - 1000BASE-T - 1000-BASE-SX - 1000-BASE-LX/LH and 1000-BASE-ZX
Switch#show mac address-table static [address {mac-address}] [interface {interface}] [vlan {vlan}]

32. What is the name of the switching technology where good frames are received - stored for inspection and then forwarded?
10 Gigabit Ethernet over 9 micron SMF (1310 nm serial laser)
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
Store-and-forward
Source MAC address; Port of arrival; VLAN; Time stamp

33. How are MAC addresses shown in the detailed output from the CEF adjacency table?
Accelerated CEF (aCEF) and Distributed CEF (dCEF)
When there are more access list entries and Layer 4 operations than available Mask/Value and LOU entries
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
Adjacent MAC address (6 octets); Layer 3 engine MAC address (6 octets); EtherType (2 octets)

34. What is the default duplex mode of a Fast Ethernet interface?
Switch#clear mac address-table [dynamic] [address {mac-address}] [interface {interface}] [vlan {vlan}]
Switch(config)#errdisable detect cause vmps
Interconnecting with existing Synchronous Optical Network (SONET) or Synchronous Digital Hierarchy (SDH) networks
Half duplex

35. What is 10BASE-T?
Mask bits set to 1 for Value bits of interest and 0 for Value bits that don't matter
Adjacent MAC address (6 octets); Layer 3 engine MAC address (6 octets); EtherType (2 octets)
Cabling specification for 10 Mbps Ethernet over Unshielded Twisted Pair (UTP) cabling
IEEE 802.3ab

36. What is 10GBASE-ER/EW?
10 Gigabit Ethernet over 9 micron SMF (1550 nm serial laser)
Process the first packet in a traffic flow to determine the destination
The adjacency table
Switch(config-if)#speed {10 | 100 | 1000 | auto}

37. Configures the maximum ageing time for entries in the MAC address table
Routing table and ARP table
Switch#show interfaces {interface} switchport
Switch(config)#mac address-table aging-time {seconds}
CEF glean

38. What is 1000BASE-LX/LH?
Switch#show running-config interface {interface}
Switch(config)#errdisable detect cause rootguard
Gigabit Ethernet over 1 pair 50 or 62.5 micron MMF or 9 micron SMF (1300 nm laser)
10 Gigabit Ethernet over 50 or 62.5 micron MMF or 9 micron SMF (1300 nm WWDM laser)

39. What are runts?
10 Gigabit Ethernet over 9 micron SMF (1550 nm serial laser)
Fast Ethernet over 2 pairs EIA/TIA Category 3 - 4 - 5 UTP
Packets that have been truncated before they were fully received
Static access or trunk

40. What is the DTP negotiation mode of a switch port configured as static access?
Forwarding Information Base
Off
Security and QoS ACLs
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

41. What is the maximum cabling distance for 10GBASE-LR/LW?
Switch#show mac address-table count [address {mac-address}] [interface {interface}] [vlan {vlan}]
Multilayer Switching
ANSI X3T11 FibreChannel
10 km

42. What is the standard for Fast Ethernet (100 Mbps)?
Switch#show adjacency [{interface}] [summary | detail]
IEEE 802.3u
Tunnel
IEEE 802.3

43. What are the symptoms of a duplex setting mismatch between two ends of a link?
Switch(config)#errdisable detect cause unicast-flood
Switch(config)#errdisable detect cause pagp-flap
When the Spanning Tree Protocol (STP) has put the switch port in learning or forwarding state
Slow response times - low throughput - runts and other input errors on the switch ports

44. Enables error-disable for errors related to 802.1x security
Switch(config)#errdisable detect cause security-violation
Layer 2 source and destination MAC addresses; Layer 3 Time-To-Live (TTL) value and header checksum
A name assigned to a ranges of interfaces
Switch#show cef not-cef-switched

45. Creates an interface-range macro
Switch(config)#define interface-range {macro-name} {type} {module}/{number} [- {number}] [ - {type} {module}/{number} ...]
Creating the VLAN
LC - MT-RJ or RJ-45
Switch(config-if)#duplex {auto | full | half}

46. What are the default error-disable detection causes?
Switch#show cef not-cef-switched
Source MAC address; Port of arrival; VLAN; Time stamp
1000BASE-CX - 1000BASE-T - 1000-BASE-SX - 1000-BASE-LX/LH and 1000-BASE-ZX
Enable error-disable for all possible causes

47. Displays a list of all interfaces in an error-disabled state
Switch#show interfaces status err-disabled
ANSI X3T11 FibreChannel
Switch(config)#interface range {type}{module}/{number} [- {number}] [ - {type}{module}/{number} ...]
Switch(config-if)#switchport access vlan {vlan}

48. Enables error-disable for conditions that trigger unicast flood blocking on a port
Switch(config)#errdisable detect cause l2ptguard
From 30 seconds to 86 -400 seconds (24 hours)
Switch(config)#errdisable detect cause unicast-flood
Process the first packet in a traffic flow to determine the destination

49. What are the administrative modes of Layer 2 switched interfaces?
Switch(config)#errdisable detect cause arp-inspection
Static access - trunk - tunnel or dynamic
Gigabit Ethernet over 1 pair 50 or 62.5 micron MMF (850 nm laser)
Collision domain

50. Enables error-disable for conditions that trigger port security configured on a port
Switch(config)#errdisable detect cause psecure-violation
IEEE 802.3ae
Accelerated CEF (aCEF) and Distributed CEF (dCEF)
Security and QoS ACLs